[Pw_forum] warning message about matdyn.x

Chengyang Li li.chengyang at wmich.edu
Wed Oct 10 18:09:27 CEST 2012

Dear Sir

     When I tried to calculate the phonon dispersion about a supercell, I can finished the scf calculation and phonon calculation , but after I got the interatomic force constant, I found I can not use matdyn.x to get the phonon frequency, and when I tried to calculate some special point's phonon frequency with ph.x, it didn't converge in 100 steps.
     The warning message is like this:

     At line 658 of file matdyn.f90 (unit = 1, file = 'cr04.fc')
      Fortran runtime error: Bad real number in item 8 of list input

     Does anyone have hint about this problem?

Chengyang Li

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