chore: add measured and calculated data for DiffractionObjects example?

[cadenmyers13]

Problem

The DiffractionObjects example doesn't have any data associated with it so you can't run the example past this point (which is very early in the example) because xcalc, ycalc, xmeas, ymeas are not defined.

calculated = DiffractionObject(xcalc, ycalc, "d")
measured = DiffractionObject(xmeas, ymeas, "tth", wavelength=0.717)
plt.plot(calculated.on_q()[0], calculated.on_q()[1])
plt.plot(measured.on_q()[0], measured.on_q()[1])
plt.show()

solution

Find and add some data!

[sbillinge]

does the data in \diffpy.utils\doc\source\examples\example_data\ not work? This is hard to find and probably not described in the docs well enough, but if it works we can use it.

[cadenmyers13]

@sbillinge not for the DiffractionObjects example. that one is missing data.

[sbillinge]

@sbillinge not for the DiffractionObjects example. that one is missing data.

but my question was that none of those example datasets will work? Not if they are all gr. In any case we just need some iq file from some project. Please do what you can!