[Pw_forum] a phcg.x error.

[戴佳钰]

Hi, everyone,

I wanted to  use the phcg.x code to calculate the IR and Raman spectra. At first,
I used pw.x to do scf calculation. The K_POINTS was put as (gamma). Then, when i
run the phcg.x, it told me that:
  from cg_readin: error
  double grid not implemented

The file *.nm.in is similar to that in example09, and there was no error when i
run the example. So, please tell me what is the reason possibly? Thank you.

Dai