improve nan comparison

fortran intel compiler is not yet well configured

.github/workflows/linuxWF.yml

@@ -124,9 +124,11 @@ jobs:
         sudo apt-get install intel-oneapi-compiler-dpcpp-cpp-and-cpp-classic intel-oneapi-mkl intel-oneapi-mkl-devel intel-oneapi-compiler-fortran
         source /opt/intel/oneapi/setvars.sh
         printenv >> $GITHUB_ENV
+        which icx
+        which ifx
         echo "CXX=icpx" >> $GITHUB_ENV
         echo "CC=icx" >> $GITHUB_ENV
-        echo "FC=ifort" >> $GITHUB_ENV
+        echo "FC=ifx" >> $GITHUB_ENV
     - name: Install MPI
       # install MPI at last since it modifies CC and CXX
       if: contains( matrix.variant, '-mpi-' )

regtest/scripts/fixzeroes.sh

@@ -6,7 +6,7 @@ grep -E '[^[:print:]]' $file 2> /dev/null && exit 0
 
 sed "s/-\(0\.0*0 \)/ \1/g; 
      s/-\(0\.0*0$\)/ \1/g" $file > $file.$$.tmp
-sed "s/-\(nan \)/ \1/g; 
-     s/-\(nan$\)/ \1/g" $file.$$.tmp > $file.$$.tmp2
+sed "s/-\(nan \)/\1/g; 
+     s/-\(nan$\)/\1/g" $file.$$.tmp > $file.$$.tmp2
 mv $file.$$.tmp2 $file