problem with RT-TDDFT script


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Just Got Here
Hi

I am trying to get the adsorbtion spectrum for water as mentioned in the example files using RT-TDDFT. I have used the command 'octave -q fft1d.m ft.dat > fw.dat' and it is working fine.

But when I use 'fft1d -d50 -z -p50000 < x.dat | rotate_fft > xw.dat' which is given in the documentation file, I get errors. The error are listed below :

rotate_fft: command not found
error: load: unable to find file -d50
error: called from
   fft1d.m at line 42 column 6

Can somebody help me please?????