[petsc-users] using KSPLSQR and SKPCGNE

[Gaurish Telang]

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/manualpages/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
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