# [Pw_forum] Wrong ELF values

Stefano de Gironcoli degironc at sissa.it
Wed Feb 16 22:48:00 CET 2011

yet... if plotrho interpolates data in a crazy way it would be better to
see on what it depends...
can you send me the "pp" file and the input to plotrho ? is the one you
posted earlier?
regards,
stefano

On 02/16/2011 06:10 PM, Claudia Loyola wrote:
> Hello!
>
> I am sorry, I did not answer before!
> well I saw the "pp" file (the *.charge in my case) and how it is a large
> file I have to use a big command line for see what are the minimum an
> maximum values for the elf calculation, and the range was from 0 to 1, so
> they are right! :) . How said Giovanni, xcrysden interpolates the data, for
> this reason, the values were out of range. Probably contour and
> plotrho output_format
> do the same.
>
> Thanks for help me! :)
> best regards,
> Claudia Loyola
>
> On Tue, Feb 15, 2011 at 10:16 AM, Stefano de Gironcoli<degironc at sissa.it>wrote:
>
>>   I see...
>> how large is your calculation? if it is not too big, would you mind send me
>> (at my email) one set of input and output to have a look ?
>> stefano
>>
>>
>> On 02/15/2011 04:42 PM, Claudia Loyola wrote:
>>
>> Hello!
>>
>> yes, you are right if I define the vectors in function of "a" and I define
>> alat=a , but let me show you how I define the vectors in the scf input file:
>>
>> &SYSTEM
>>    ibrav = 0 ,
>>    celldm(1) =1.0 ,
>> .
>> .
>> .
>> CELL_PARAMETERS (alat=1.0)
>>    19.109476287  -0.014917030   0.000000953
>>    -9.542147268  16.554932043   0.000000170
>>     0.000000706   0.000000344  14.136501037
>>
>> so in this case the vector basis are the real large in bohr, and the alat is
>> 1.0 like celldm(1). Indeed, the value of the vectors for pp.x are in
>> function of alat, but my alat is 1.0, so I can write directly in bohr the
>> values of the planes that I take, in fact I take "two replicates" in each
>> direction. I think this is correct too.
>>
>>
>> regards,
>> Claudia Loyola
>>
>> On Tue, Feb 15, 2011 at 2:01 AM, Stefano de Gironcoli<degironc at sissa.it>  <degironc at sissa.it>wrote:
>>
>>
>>   Dear Claudia,
>>     I may not remember correctly what the format adopted by pp.x to
>> define planes is... but i think it is Cartesian coordinates in unit of
>> alat (aka celldm(1)).
>>
>>     so when you write
>>       e1(1) =38.218, e1(2)=0.0, e1(3) = 0.0,
>>      e2(1) =0.0, e2(2)=33.108, e2(3) = 0.0,
>> this means presumably 38 x 33 UNIT CELLS, sampled with 100x100 points
>> (that is about 2-3 points in each unit cell). No surprise the FFT
>> interpolation used gets confused.
>>
>> I think you should use more sensible values for e1(1) and e2(2)... what
>> is your value of celldm(1)?
>>
>> At least this is my guess.
>>
>> stefano
>>
>>
>> On 02/14/2011 06:57 PM, Claudia Loyola wrote:
>>
>>   Well, this is one of the input file:
>>
>> &inputpp
>>    &plot
>>       nfile = 1 ,
>>       filepp(1) = 'Ba38_33_10.charge' ,
>>       weight(1) = 1.0 ,
>>       iflag = 2 ,
>>       output_format = 3 ,
>>       fileout = 'ba.rho38_33_10.xsf' ,
>>       x0(1) =0.0, x0(2)=0.0, x0(3) = 10.602,
>>       e1(1) =38.218, e1(2)=0.0, e1(3) = 0.0,
>>       e2(1) =0.0, e2(2)=33.108, e2(3) = 0.0,
>>       nx=100, ny=100
>>    /
>>
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