Does new version of NWCHEM provide T1 diagnostic for CC ?


Clicked A Few Times
Thank a lot.

Zongtang

Gets Around
No, an attempt was started in 2008 but it was never finished. If you are adventurous and want to play with the incomplete code, be aware that the existing routine only works with CCSDT or CCSDTQ calculations -- no CCSD or CCSD(T).

Here's a small input that activates the incomplete T1 diagnostic code and causes it to print extra information about residuals in the output.

start tce_hf_t1

echo

geometry units angstroms print xyz
  F        0.93689        0.07724       -0.00707
  H        1.81689        0.07724       -0.00707
  symmetry c1
end

basis spherical
  * library cc-pvdz
end

scf
  thresh 1.0e-10
  tol2e 1.0e-10
  singlet
  rhf
end

task scf optimize

tce
  freeze atomic
  ccsdt
  tilesize 20
  thresh 1.0d-6
end

set tce:diagnt1 .true.

task tce energy


It's the line "set tce:diagnt1 .true." that turns on the diagnostic. If you want to look at the source it's in src/tce/tce_diagnose_t1.F.

Clicked A Few Times
I really appreciate.

Zongtang

Gets Around
Quote:Mernst Jun 27th 6:08 am
No, an attempt was started in 2008 but it was never finished. If you are adventurous and want to play with the incomplete code, be aware that the existing routine only works with CCSDT or CCSDTQ calculations -- no CCSD or CCSD(T).

<snip>

It's the line "set tce:diagnt1 .true." that turns on the diagnostic. If you want to look at the source it's in src/tce/tce_diagnose_t1.F.


I have no idea if that code (which I wrote) is even remotely correct. Please please please do not rely upon it unless you have verified it with a third-party implementation.

Thanks,

Jeff


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