[petsc-users] Petsc for solving a sparse under-determined system

[Mengda Wu]

Hi all,

    How should I use Petsc to solve a sparse under-determined system?
Basically, I need a quick solution to solve
Ax=b, where is A is a sparse (possibly nonsymmetric) matrix of size m x n,
where m<n. The solution I need to find is to minimize |x|^2.

    I know SPQR(http://www.cise.ufl.edu/research/sparse/SPQR/) can do this.
But if Petsc has some functions or
wrappers, it will be great to stick with Petsc.

Thanks,
Mengda
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