[QE-users] Counting Basis Functions

[Stefano de Gironcoli]

On 19/02/20 17:58, Ben Comer wrote:
> sticks:   dense  smooth     PW     G-vecs:    dense smooth      PW
>      Sum         499     199        55                     51837 
> 13151      1677 

there are 51837 G vectors such that ekin < ecutrho   ... this is used to 
expand the density

there are 131151 G-vectorse such that ekin < ecutwfc*4 ... this is used 
to apply the potential on a wfc

there are  1677 G-vectrose such that ekin < ecutwfc ...  this used to 
expand the wfcs

-

sticks refers to the fact that G-vectors are organized in z-oriented 
sticks. this affects the fft distribution

  499 non empty sticks in the FFT up to ecutrho, 199 non empty sticks in 
the FFT up to ecutwfc*4, 55 non-empty sticks in the FFT up to Ecutwfc