[Wien] GMAX, FFT-dimension, c-star, c(G) coefficients

fatemeh.mirjani f_mirjani at ph.iut.ac.ir
Sat Aug 23 13:53:23 CEST 2008


Dear Prof.Blaha;

I have run Silicon with different GMAX. The following list is the result of run:

GMAX         MINIMUM FFT-mesh in LAPW0          FFT-parameters      IFFT-PARAMETERS USED   number of G-vectors(for 3kpoints)
   8                  16                               54                   22                137,156,150
  10                  20                               72                   22                137,156,150
  12                  24                               80                   22                137,156,150
  14                  30                               96                   22                137,156,150
---------------------------------------------------------------------
***You said the FFT-dimension should be (2*GMAX)+1 and a multiple of 2,3,5 .
These result are not equal to (2*GMAX)+1 and a multiple of 2,3,5. Why?

***another problem is the number of c-star coefficients or the number of G-vectors in case.output1 . I expected the number of c-star coefficients change when I change GMAX. but they are fixed! Why?

***Since my problem is extracting the c(G) coefficients (without symmetry) and I couldn't extract them form WIEN2k, I'm trying to find a relation between the number of c-star coefficients and FFT-dimension and symmetry operations in order to write a program which be able to take c-star coefficients as input and gives all c-coefiicients (without symmetry) as output. Is it feasible?
------------------------------------------------------------------------------- 

Gmax=8
3kpoints
number of G-vectors for each kpoint & each band:   for kpoint1=137    kpoint2=156     kpoint3=150  
1.outputd: MINIMUM FFT-mesh in LAPW0   16   16   16
1.outputm: IFFT-PARAMETERS USED:          22          22          22
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf0::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
Gmax=10
number of G-vectors for each kpoint & each band:   for kpoint1= 137    kpoint2=156     kpoint3=150  
1.outputd: MINIMUM FFT-mesh in LAPW0   20   20   20
1.outputm: IFFT-PARAMETERS USED:          22          22          22
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00
1.scf0::IFFT  : FFT-parameters:   72   72   72 Factor: 2.00

Gmax=12 
 3kpoint 
number of G-vectors for each kpoint & each band:   for kpoint1= 137    kpoint2=156     kpoint3=150  
1.outputd: MINIMUM FFT-mesh in LAPW0   24   24   24
1.outputm: IFFT-PARAMETERS USED:          22          22          22
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf0::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00

Gmax=14
3kpoints
number of G-vectors for each kpoint & each band: 137    156     150  
1.outputd: MINIMUM FFT-mesh in LAPW0   30   30   30
1.outputm: IFFT-PARAMETERS USED:          22          22          22
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   80   80   80 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00

1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   54   54   54 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
1.scf0::IFFT  : FFT-parameters:   96   96   96 Factor: 2.00
-----------------------------------------------------------------------------------------------------
Your help is appreciated like your previous favor.

With best regards,
Fatemeh

-- 
+------------------------------------------------------------------------------+
|Fatemeh Mirjani                              | Email: f_mirjani at ph.iut.ac.ir  |
|Computational Condensed Matter Research Lab. | Tel/Fax Office: +98311-3913746 |
|ICTP Affiliated Center in Isfahan,           | Tel Lab.: +98311-3913731       |
+----------Physics Department, Isfahan University of Technology, Iran----------+



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