Product of trans(A)*A

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Product of trans(A)*A

Postby PetrosFeggaras » Fri Jun 14, 2013 12:41 pm

Hi,
The product of a matrix with its transpose obtains a symmetric matrix. Is there a special blas/lapack function for this or one uses ?gemm ?
TIA,
Petros
Update: I guess was looking for dsyrk. Thank you
PetrosFeggaras
 
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Re: Product of trans(A)*A

Postby Julien Langou » Fri Jun 14, 2013 12:54 pm

Yep DSYRK. Half of of the FLOPS as GEMM, and pretty much same efficiency, so twice faster in the end. J.
Julien Langou
 
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