Re: [Wien] How to use the LIBXC library?

2017-01-19 Thread Abderrahmane Reggad
You have right Dr gavin

When I have opened the link in another web browser I could get the new
version of userguide.I get the same version after I have delete the cash
data.

Thanks

Best regards



-- 
Mr: A.Reggad
Laboratoire de Génie Physique
Université Ibn Khaldoun - Tiaret
Adresse: BP 144 AL ATTAF AIN DEFLA
Tel: +213(0)561861963
Algerie
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Re: [Wien] How to use the LIBXC library?

2017-01-18 Thread Abderrahmane Reggad
Thanks Dr gavin for all

I still get the old version , I don't know why

Best regards

-- 
Mr: A.Reggad
Laboratoire de Génie Physique
Université Ibn Khaldoun - Tiaret
Adresse: BP 144 AL ATTAF AIN DEFLA
Tel: +213(0)561861963
Algerie
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Re: [Wien] How to use the LIBXC library?

2017-01-18 Thread Gavin Abo
http://susi.theochem.tuwien.ac.at/reg_user/textbooks/usersguide.pdf - 
When a new WIEN2k version is released, the file at that link gets updated.


At least for me, when I enter that link today (January 18, 2017) into my 
web browser, it is showing me on the cover page:


User’s Guide, WIEN2k 16.1 (Release 12/12/2016)

On 1/18/2017 3:11 AM, Abderrahmane Reggad wrote:

Thank you Dr for your detailed explanation as usual.

Now, It becomes clear to me

But the link of the userguide is for that of WIEN2k 14.2 version.

Best regards

--
Mr: A.Reggad
Laboratoire de Génie Physique
Université Ibn Khaldoun - Tiaret
Adresse: BP 144 AL ATTAF AIN DEFLA
Tel: +213(0)561861963
Algerie
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Re: [Wien] How to use the LIBXC library?

2017-01-18 Thread Abderrahmane Reggad
Thank you Dr for your detailed explanation as usual.

Now, It becomes clear to me

But the link of the userguide is for that of WIEN2k 14.2 version.

Best regards

-- 
Mr: A.Reggad
Laboratoire de Génie Physique
Université Ibn Khaldoun - Tiaret
Adresse: BP 144 AL ATTAF AIN DEFLA
Tel: +213(0)561861963
Algerie
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Re: [Wien] How to use the LIBXC library?

2017-01-17 Thread Gavin Abo


The new version of wien2k is arrived but there is no sufficient 
information on how to use the new library LIBXC implemented


Section 7.1.3 on page 112 of the WIEN2k 16.1 usersguide [ 
http://susi.theochem.tuwien.ac.at/reg_user/textbooks/usersguide.pdf ] has:


Example for PBE with the
- global keyword : XC_PBE
- LIBXC-keywords : XC_GGA_X_PBE XC_GGA_C_PBE

The first line of case.in0 on page 110 uses the WIEN2k PBE implementation:

TOT  XC_PBE

To use the LIBXC implementation, I followed the above given example and 
changed the first line in case.in0 to:


TOT  XC_GGA_X_PBE XC_GGA_C_PBE

On page 112, it has:

Keywords to use functionals from the library of exchange and correlation 
functionals LIBXC 
(http://www.tddft.org/programs/octopus/wiki/index.php/Libxc).


Say one is interested in a GGA PW91 calculation.  So went to that page 
of the LIBXC website, clicked on the "Version 3.0" link, which directs to:


http://octopus-code.org/wiki/Libxc_3.0_functionals

There in the list for GGA PW91 is:

GGA_X_PW91
GGA_C_PW91

Also, in the list, GGA PBE is:

GGA_X_PBE
GGA_C_PBE

From the example, it can be seen that XC_ was added to the beginning of 
it.  So first line in case.in0 for a LIBXC GGA PW91 calculation becomes:


TOT  XC_GGA_X_PW91 XC_GGA_C_PW91

and how to combine the different functionals for exchange and 
correlation to get a result close to the experimental one.


In the list at http://octopus-code.org/wiki/Libxc_3.0_functionals, it 
looks like there are like 50+ articles.  Each functional is usually 
designed to solve a "specific" problem or application.  So you have to 
read articles and choose an appropriate one for your application.  So 
each of those articles are basically giving their own answer to your 
question.  Also, that may also be the reason for the LIBXC library, 
nobody probably has the answer to the question for the new combinations, 
which gives researchers something new to study.

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[Wien] How to use the LIBXC library?

2017-01-17 Thread Abderrahmane Reggad
Dear wien developpers

The new version of wien2k is arrived but there is no sufficient information
on how to use the new library LIBXC implemented and how to combine the
different functionals for exchange and correlation to get a result close to
the experimental one.

Best regards

-- 
Mr: A.Reggad
Laboratoire de Génie Physique
Université Ibn Khaldoun - Tiaret
Adresse: BP 144 AL ATTAF AIN DEFLA
Tel: +213(0)561861963
Algerie
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