Cheatsheets1/Numpy_Cheatsheet.ipynb

{
  "nbformat": 4,
  "nbformat_minor": 0,
  "metadata": {
    "colab": {
      "name": "Numpy_Cheatsheet.ipynb",
      "version": "0.3.2",
      "provenance": []
    },
    "kernelspec": {
      "name": "python3",
      "display_name": "Python 3"
    }
  },
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "GSao7LovOgpm",
        "colab_type": "text"
      },
      "source": [
        "The NumPy library is the core library for scientific computing in\n",
        "Python. It provides a high-performance multidimensional array\n",
        "object, and tools for working with these arrays.\n",
        "\n",
        "---\n",
        "\n",
        "import numpy as np\n",
        "\n",
        "Use the following import convention:"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "HdacAqT_OfLJ",
        "colab_type": "code",
        "colab": {}
      },
      "source": [
        "import numpy as np"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "9STEWhl1OtR1",
        "colab_type": "code",
        "outputId": "386624c8-0942-44dc-bfe6-50fc174cd7bd",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 153
        }
      },
      "source": [
        "# Creating Array\n",
        "a = np.array([1,2,3]) #one dimensional array\n",
        "b = np.array([(1.5,2,3), (4,5,6)], dtype = float)\n",
        "c = np.array([[(1.5,2,3), (4,5,6)], [(3,2,1), (4,5,6)]],\n",
        "dtype = float)\n",
        "print(a)\n",
        "print(b)\n",
        "print(c)"
      ],
      "execution_count": 89,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[1 2 3]\n",
            "[[1.5 2.  3. ]\n",
            " [4.  5.  6. ]]\n",
            "[[[1.5 2.  3. ]\n",
            "  [4.  5.  6. ]]\n",
            "\n",
            " [[3.  2.  1. ]\n",
            "  [4.  5.  6. ]]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "tlBZjVxdUaTq",
        "colab_type": "text"
      },
      "source": [
        "## Initial Placeholders"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "ZZN-53biUXFr",
        "colab_type": "code",
        "outputId": "3b0c798b-a2e9-433f-98a0-480ea4dd093d",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 68
        }
      },
      "source": [
        "# Create an array of zeros\n",
        "np.zeros((3,4))"
      ],
      "execution_count": 90,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[0., 0., 0., 0.],\n",
              "       [0., 0., 0., 0.],\n",
              "       [0., 0., 0., 0.]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 90
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "fysO8kheUj3k",
        "colab_type": "code",
        "outputId": "47e95be7-0b97-400f-fe1a-841a9c6b9f30",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 68
        }
      },
      "source": [
        "# Create an array of ones\n",
        "np.ones((3,4), dtype = np.int16)"
      ],
      "execution_count": 91,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[1, 1, 1, 1],\n",
              "       [1, 1, 1, 1],\n",
              "       [1, 1, 1, 1]], dtype=int16)"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 91
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "pb_nbJpNUorE",
        "colab_type": "code",
        "outputId": "3a0872b2-d2e3-4ffa-8a35-3c1a1aa87b2e",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "#Create an array of evenly spaced values (step value)\n",
        "d = np.arange(10,25,5) \n",
        "print(d)"
      ],
      "execution_count": 92,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[10 15 20]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "jfMt7ydzVCjq",
        "colab_type": "code",
        "outputId": "9218c6d8-e1d0-49b8-b06f-99d5ad35e45e",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "# Create an array of evenly spaced values (number of samples)\n",
        "np.linspace(0,2,9)"
      ],
      "execution_count": 93,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([0.  , 0.25, 0.5 , 0.75, 1.  , 1.25, 1.5 , 1.75, 2.  ])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 93
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "9XR-jZaCVnpd",
        "colab_type": "code",
        "outputId": "42ff0997-e2b2-4e9e-de25-693b8ce67275",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Create a constant array\n",
        "e = np.full((2,2),7)\n",
        "print(e)"
      ],
      "execution_count": 94,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[7 7]\n",
            " [7 7]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "r3cPqm-GVujq",
        "colab_type": "code",
        "outputId": "f8a0e0a5-df91-41e0-84c2-cab4a9716908",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Create a 2X2 identity matrix\n",
        "f = np.eye(2)\n",
        "print(f)"
      ],
      "execution_count": 95,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[1. 0.]\n",
            " [0. 1.]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "P6siTuL2V58G",
        "colab_type": "code",
        "outputId": "84fb78dc-dcdb-4a90-cf06-8e3ab4a0a209",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Create an array with random values\n",
        "np.random.random((2,2))"
      ],
      "execution_count": 96,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[0.16349153, 0.45692408],\n",
              "       [0.5095391 , 0.47522291]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 96
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "iTqUrqsQWAKA",
        "colab_type": "code",
        "outputId": "af65697d-31d8-470f-c24f-5421c8d2393f",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 68
        }
      },
      "source": [
        "# Create an empty array\n",
        "np.empty((3,2))"
      ],
      "execution_count": 97,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[1.5, 2. ],\n",
              "       [3. , 4. ],\n",
              "       [5. , 6. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 97
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "12yj21WRWHiy",
        "colab_type": "text"
      },
      "source": [
        "# I/O"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "_Ih9evxOWMmo",
        "colab_type": "text"
      },
      "source": [
        "## Saving & Loading On Disk"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "JTZLKJSgWGxx",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "805ca9ae-103e-4d0f-8ed1-210dfa182564"
      },
      "source": [
        "np.save('my_array', a)\n",
        "np.savez('array.npz', a, b)\n",
        "np.load('my_array.npy')"
      ],
      "execution_count": 98,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([1, 2, 3])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 98
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "Tkfr5MFvYgcn",
        "colab_type": "text"
      },
      "source": [
        "## Inspecting Your Array"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "xS07k10LYQmQ",
        "colab_type": "code",
        "outputId": "5eed1203-1549-4f13-c725-d10ac4838fc2",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 0
        }
      },
      "source": [
        "# Array dimensions\n",
        "a.shape"
      ],
      "execution_count": 99,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "(3,)"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 99
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "Ho9G8ik3YxN2",
        "colab_type": "code",
        "outputId": "c6d63ae7-7ba5-4deb-8078-d72d2ea56670",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 0
        }
      },
      "source": [
        "# Length of array\n",
        "# a.size\n",
        "print(len(a))"
      ],
      "execution_count": 100,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "3\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "jxXe8Jo7ZD1V",
        "colab_type": "code",
        "outputId": "2dce6d17-bed5-4930-defa-ecad6c1535e7",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 0
        }
      },
      "source": [
        "# Number of array dimensions\n",
        "b.ndim"
      ],
      "execution_count": 101,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "2"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 101
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "1LqzMBkIZOtz",
        "colab_type": "code",
        "outputId": "0b61ec46-72b3-4dc7-edf9-4167bbe1aaa8",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 0
        }
      },
      "source": [
        "# Number of array elements\n",
        "e.size"
      ],
      "execution_count": 102,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "4"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 102
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "MF7pZR_4ZVRU",
        "colab_type": "code",
        "outputId": "18db6fd5-9c27-486f-e5c9-4f13ab4514d7",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 0
        }
      },
      "source": [
        "# Data type of array elements\n",
        "b.dtype"
      ],
      "execution_count": 103,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "dtype('float64')"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 103
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "nNbxc-ulZfNj",
        "colab_type": "code",
        "outputId": "5b0df354-1a6d-4f44-e215-231ceffb7f97",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 0
        }
      },
      "source": [
        "# Name of data type\n",
        "b.dtype.name"
      ],
      "execution_count": 104,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "'float64'"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 104
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "Pjc3bMbLZfLW",
        "colab_type": "code",
        "outputId": "257cf84b-8e47-4969-e1eb-f316bd29201e",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 0
        }
      },
      "source": [
        "# Convert an array to a different type\n",
        "b.astype(int)"
      ],
      "execution_count": 105,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[1, 2, 3],\n",
              "       [4, 5, 6]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 105
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "rSef8NB1aArP",
        "colab_type": "text"
      },
      "source": [
        "# Array Mathematics"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "vYxGrmVvaFE8",
        "colab_type": "text"
      },
      "source": [
        "## Arithmetic Operations"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "TmonErjDaBm1",
        "colab_type": "code",
        "outputId": "467ef534-3f44-441b-9f95-b3d3eee3aab8",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Subtraction\n",
        "g = a - b\n",
        "print(g)"
      ],
      "execution_count": 106,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[-0.5  0.   0. ]\n",
            " [-3.  -3.  -3. ]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "YDmUV_zuaOYT",
        "colab_type": "code",
        "outputId": "40cea5e1-a3d7-469a-bbe6-0c84392adbff",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Substrcation\n",
        "np.subtract(a,b)"
      ],
      "execution_count": 107,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[-0.5,  0. ,  0. ],\n",
              "       [-3. , -3. , -3. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 107
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "e-6xKb9maZLJ",
        "colab_type": "code",
        "outputId": "67291840-8456-41cf-c65b-7a799ef85769",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Addition\n",
        "h = a + b\n",
        "print(h)"
      ],
      "execution_count": 108,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[2.5 4.  6. ]\n",
            " [5.  7.  9. ]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "ykIO5yMtaeYd",
        "colab_type": "code",
        "outputId": "d7d9c782-4d0a-4a12-be5d-9b12d2ce3752",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Addition\n",
        "np.add(a,b)"
      ],
      "execution_count": 109,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[2.5, 4. , 6. ],\n",
              "       [5. , 7. , 9. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 109
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "zHanUrd4apQ8",
        "colab_type": "code",
        "outputId": "f55e1459-2ed3-4cce-f98e-2bdf02cd013e",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Division\n",
        "i = a/b\n",
        "print(i)"
      ],
      "execution_count": 110,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[0.66666667 1.         1.        ]\n",
            " [0.25       0.4        0.5       ]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "O8l0qZxNat3B",
        "colab_type": "code",
        "outputId": "d98e6a40-45aa-413a-c140-03c0a8f6ae1c",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Divisoin\n",
        "np.divide(a,b)"
      ],
      "execution_count": 111,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[0.66666667, 1.        , 1.        ],\n",
              "       [0.25      , 0.4       , 0.5       ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 111
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "cpqAPDJRa1F6",
        "colab_type": "code",
        "outputId": "1edd61c4-e81b-4984-cf96-9ad812b3977b",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Multiplication\n",
        "k = a*b\n",
        "print(k)"
      ],
      "execution_count": 112,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[[ 1.5  4.   9. ]\n",
            " [ 4.  10.  18. ]]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "1Thf3QuObITP",
        "colab_type": "code",
        "outputId": "fe08b3b0-32f0-4ce2-b7fc-1a73168bb4a4",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Multiplication\n",
        "np.multiply(a,b)"
      ],
      "execution_count": 113,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[ 1.5,  4. ,  9. ],\n",
              "       [ 4. , 10. , 18. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 113
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "P9ynGmfRbrbw",
        "colab_type": "code",
        "outputId": "320a36d2-0e68-4222-e7af-a9c8575f64dd",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Exponentiation\n",
        "np.exp(b)"
      ],
      "execution_count": 114,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[  4.48168907,   7.3890561 ,  20.08553692],\n",
              "       [ 54.59815003, 148.4131591 , 403.42879349]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 114
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "Wf7__Jt3buug",
        "colab_type": "code",
        "outputId": "eb7a4f68-6fb0-4f43-9a4c-5324669fc0c3",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Square root\n",
        "np.sqrt(b)"
      ],
      "execution_count": 115,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[1.22474487, 1.41421356, 1.73205081],\n",
              "       [2.        , 2.23606798, 2.44948974]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 115
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "9GpCUJPgbzj3",
        "colab_type": "code",
        "outputId": "8a8f6569-b953-47e0-feb0-64ca9baaf6ef",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "# Print sines of an array\n",
        "np.sin(a)"
      ],
      "execution_count": 116,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([0.84147098, 0.90929743, 0.14112001])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 116
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "a7VFvAyHb4K9",
        "colab_type": "code",
        "outputId": "e041dc04-ee58-418c-8a84-6e2abec4a2bc",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "# Element-wise cosine\n",
        "np.cos(a)"
      ],
      "execution_count": 117,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([ 0.54030231, -0.41614684, -0.9899925 ])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 117
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "nIeescw8cDhZ",
        "colab_type": "code",
        "outputId": "0bf55834-6d38-46af-bfe8-645169369467",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        }
      },
      "source": [
        "# Element-wise natural logarithm\n",
        "np.log(a)"
      ],
      "execution_count": 118,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([0.        , 0.69314718, 1.09861229])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 118
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "EI3Wxehyb5Yf",
        "colab_type": "code",
        "outputId": "a0e70552-279b-44a5-d2cf-587b76a6a54b",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        }
      },
      "source": [
        "# Dot product\n",
        "e.dot(f)"
      ],
      "execution_count": 119,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[7., 7.],\n",
              "       [7., 7.]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 119
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "lzTLsrtTWlR_",
        "colab_type": "text"
      },
      "source": [
        "## Comparison"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "xZSl8preW6mP",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        },
        "outputId": "f1ab2bed-736e-48b3-bfe1-5dc57952992d"
      },
      "source": [
        "# Element-wise comparison\n",
        "a == b"
      ],
      "execution_count": 120,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[False,  True,  True],\n",
              "       [False, False, False]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 120
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "kJM9HUGnXZ3M",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "88d2af72-6539-4116-b2a1-357be59c4400"
      },
      "source": [
        "# Element-wise comparison\n",
        "a < 2"
      ],
      "execution_count": 121,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([ True, False, False])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 121
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "LFJAm8cuXgiq",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "ab03c30c-7289-4254-d737-92c1f5c13161"
      },
      "source": [
        "# Array-wise comparison\n",
        "np.array_equal(a, b)"
      ],
      "execution_count": 122,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "False"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 122
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "zECulZVYXtox",
        "colab_type": "text"
      },
      "source": [
        "## Aggregate Functions"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "Em8uRLUkXpNz",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "21f460eb-9523-4a28-b502-891c03dd9def"
      },
      "source": [
        "# Array-wise sum\n",
        "a.sum()"
      ],
      "execution_count": 123,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "6"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 123
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "PxJZ0WDwYVRr",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "85d446a4-e7eb-4b2e-ac72-f57db164384e"
      },
      "source": [
        "# Array-wise minimum value\n",
        "a.min()"
      ],
      "execution_count": 124,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "1"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 124
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "rviZv-stYbcs",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "48228dcd-6a57-4a07-fad2-8ea4dfe06171"
      },
      "source": [
        "# Maximum value of an array row\n",
        "b.max(axis=0)"
      ],
      "execution_count": 125,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([4., 5., 6.])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 125
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "qbqB39KXYgyN",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        },
        "outputId": "fc3a5ddb-1fe4-49ba-ed26-5b64ee0bb003"
      },
      "source": [
        "# Cumulative sum of the elements\n",
        "b.cumsum(axis=1)"
      ],
      "execution_count": 126,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[ 1.5,  3.5,  6.5],\n",
              "       [ 4. ,  9. , 15. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 126
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "QAw7bpoKYm05",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "2c5c0f88-0421-49ac-c982-9f4d914d465a"
      },
      "source": [
        "# Mean\n",
        "a.mean()"
      ],
      "execution_count": 127,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "2.0"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 127
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "E_yhi-h7YtCC",
        "colab_type": "code",
        "colab": {}
      },
      "source": [
        "# Median\n",
        "a.median()"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "FdOBEt6DZvYt",
        "colab_type": "code",
        "colab": {}
      },
      "source": [
        "#Correlation coefficient\n",
        "a.corrcoef()"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "UxUXoFsDaSuO",
        "colab_type": "code",
        "colab": {}
      },
      "source": [
        "#Standard deviation\n",
        "np.std(b)"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "lgKZ41_0aliQ",
        "colab_type": "text"
      },
      "source": [
        "## Copying Arrays"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "sm4GFW6rafx7",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "7d04708d-21d6-413b-bf8e-e2c9e24c3132"
      },
      "source": [
        "# Create a view of the array with the same data\n",
        "h = a.view()\n",
        "print(h)"
      ],
      "execution_count": 129,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[1 2 3]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "_GpUS22uav2s",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "ae5654cd-1d89-4042-e54c-10a10922b289"
      },
      "source": [
        "# Create a copy of the array\n",
        "np.copy(a)"
      ],
      "execution_count": 130,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([1, 2, 3])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 130
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "n3hSEsEQa2Uk",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "60ecad99-22d7-4c41-9d20-1b0a67ffe6bb"
      },
      "source": [
        "# Create a deep copy of the array\n",
        "h = a.copy()\n",
        "print(h)"
      ],
      "execution_count": 131,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "[1 2 3]\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "8BxkaAEcb7mP",
        "colab_type": "text"
      },
      "source": [
        "## Sorting Arrays"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "bxnd8G1hb88g",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "bd79fdd3-1c5b-4aca-c330-9f1fef6a27e2"
      },
      "source": [
        "# Sort an array\n",
        "print(a.sort())"
      ],
      "execution_count": 132,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "None\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "ZAsOEeXAcCiw",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "34b6f462-b60f-4a8c-aeaf-82fd1d4e6ef1"
      },
      "source": [
        "#Sort the elements of an array's axis\n",
        "print(c.sort(axis=0))"
      ],
      "execution_count": 133,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "None\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "EtrPuNQAczT-",
        "colab_type": "text"
      },
      "source": [
        "## Subsetting, Slicing, Indexing"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "qq4IMDcxdIeD",
        "colab_type": "text"
      },
      "source": [
        "### Subsetting"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "CheFYDqVc0rp",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "fd6f6c02-d926-4f1d-f833-cc343790fc88"
      },
      "source": [
        "#Select the element at the 2nd index\n",
        "a[2]"
      ],
      "execution_count": 134,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "3"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 134
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "YKd91Jevc_vK",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "417b48dd-43e8-423a-8ffd-f1b7dfbeddbe"
      },
      "source": [
        "# Select the element at row 1 column 2 (equivalent to b[1][2])\n",
        "b[1,2]"
      ],
      "execution_count": 136,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "6.0"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 136
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "r0WRV-n4dMw_",
        "colab_type": "text"
      },
      "source": [
        "### Slicing"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "CU5gQ850dFbH",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "06f0bc2e-2c5b-46ef-e771-a28ef0b1c491"
      },
      "source": [
        "# Select items at index 0 and 1\n",
        "a[0:2]"
      ],
      "execution_count": 137,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([1, 2])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 137
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "S1sbExp1dTIA",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "0cb6da77-f88e-4caa-8e01-0e8ff522e48d"
      },
      "source": [
        "# Select items at rows 0 and 1 in column 1\n",
        "b[0:2,1]"
      ],
      "execution_count": 138,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([2., 5.])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 138
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "_kJWm4ODduvw",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "022f3b69-9a0e-4519-a7f7-a828fe3fef95"
      },
      "source": [
        "# Select all items at row 0 (equivalent to b[0:1, :])\n",
        "b[:1]"
      ],
      "execution_count": 140,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[1.5, 2. , 3. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 140
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "26WtK85od7tt",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "7ca2882b-9808-48ff-8c1e-d4ac8a1306df"
      },
      "source": [
        "# Reversed array a\n",
        "a[ : :-1]"
      ],
      "execution_count": 141,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([3, 2, 1])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 141
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "kFMHE-n3ffNk",
        "colab_type": "text"
      },
      "source": [
        "## Array Manipulation"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "qeeP6LDYfgR8",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 51
        },
        "outputId": "d697ca35-ceaa-4a59-8cc1-3c2881727a0c"
      },
      "source": [
        "#Transposing Array\n",
        "i = np.transpose(b)\n",
        "i.T"
      ],
      "execution_count": 143,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[1.5, 2. , 3. ],\n",
              "       [4. , 5. , 6. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 143
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "mhSCx7sAftkO",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "c1c48d28-67fb-4f12-8f77-fc5e402887ac"
      },
      "source": [
        "# Changing Array Shape\n",
        "b.ravel()"
      ],
      "execution_count": 145,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([1.5, 2. , 3. , 4. , 5. , 6. ])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 145
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "Z5TiOitefyJq",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 68
        },
        "outputId": "282145f0-6175-47f5-93f1-d7b4f3ed7b20"
      },
      "source": [
        "g.reshape(3,-2)"
      ],
      "execution_count": 148,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([[-0.5,  0. ],\n",
              "       [ 0. , -3. ],\n",
              "       [-3. , -3. ]])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 148
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "yZ9ANvtKf3On",
        "colab_type": "code",
        "colab": {}
      },
      "source": [
        "## Adding/Removing Elements\n",
        "h.resize((2,6))\n"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "ObTo41NmgBa-",
        "colab_type": "code",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "outputId": "52f8c726-4c8f-462e-f893-bd270a0a25a2"
      },
      "source": [
        "# Combining Arrays\n",
        "np.concatenate((a,d),axis=0)"
      ],
      "execution_count": 150,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "array([ 1,  2,  3, 10, 15, 20])"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 150
        }
      ]
    }
  ]
}