[petsc-users] using KSPLSQR and SKPCGNE

[Chetan Jhurani]

See the emails in this thread "KSPLSQR convergence criterion" for
explicit calls for LSQR and some more info.
http://lists.mcs.anl.gov/pipermail/petsc-users/2010-August/thread.html#6784
 
Chetan


  _____  

From: petsc-users-bounces at mcs.anl.gov
[mailto:petsc-users-bounces at mcs.anl.gov] On Behalf Of Gaurish Telang
Sent: Monday, January 17, 2011 01:16 AM
To: petsc-users at mcs.anl.gov
Subject: [petsc-users] using KSPLSQR and SKPCGNE


Hi,

I am new to PETSc and I wanted to solve some least squares problems with it.
On searching the net I found that KSPLSQR() and KSPCGNE() solve the least
squares system |Ax-b|

But I don't really know how to use these functions to get my answer. This
manual page did not help:
http://www.mcs.anl.gov/petsc/petsc-2/snapshots/petsc-current/docs/manualpage
s/KSP/KSPLSQR.html

Apparently no tutorial code uses these functions. 

If anyone could could give a small code snippet of how to use these
functions (assuming A and b are given) then it would be really helpful. 

Thanks,

Gaurish


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110117/bb57e51c/attachment.htm>