[petsc-users] A^TA

[Kuhlemann, Verena]

Thanks, I'll try that.

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From: petsc-users-bounces at mcs.anl.gov [petsc-users-bounces at mcs.anl.gov] on behalf of Jed Brown [jedbrown at mcs.anl.gov]
Sent: Friday, February 03, 2012 5:54 PM
To: PETSc users list
Subject: Re: [petsc-users] A^TA

On Sat, Feb 4, 2012 at 01:47, Kuhlemann, Verena <vkuhlem at emory.edu<mailto:vkuhlem at emory.edu>> wrote:
Hi,

one quick question: I have a matrix P and need to compute P^t*P.
Is there a function available for this? I couldn't find anything.
Right now I am computing P^t*P by using MatPtAP with A=identity,
but I was hoping there is another way where I don't need to set up
the identity matrix.

Use petsc-dev and MatTransposeMatMult(P,P,...,&PtP)

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