FORCE_CONSTANTS = WRITE. Gnuplot style datum are output to standard output. The first part contains broaden and superposed elements of force constant matrix as a function of distance. The successive elements of force constants are broadened by Gaussian function and are normalized by their values. The second part contains just the elements as a function of distance. This part is good to see the convergence of elements themselves.
yaml2forceconstant.rbPlotting examples of Gnuplot are written as follows,
p "stdout.dat" index 0 w l p "stdout.dat" index 1 using 3:4 w imp p "stdout.dat" index 1 using 3:(log10(abs($4)) w imp