efficient way to solve X*A=B

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efficient way to solve X*A=B

Postby ottapav » Sun Sep 04, 2011 4:00 am

for me it seems to be too complicated to solve X*A=B, like A'*X'=B' with DTRTRS. Moreover A is triangular and with B are parts of one matrix. How to solve this "standardized" problem efficient?
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Re: efficient way to solve X*A=B

Postby admin » Tue Sep 20, 2011 5:32 pm

Did you try to call the BLAS routine: DTRSM directly?

Code: Select all
*  DTRSM  solves one of the matrix equations
*     op( A )*X = alpha*B,   or   X*op( A ) = alpha*B,
*  where alpha is a scalar, X and B are m by n matrices, A is a unit, or
*  non-unit,  upper or lower triangular matrix  and  op( A )  is one  of
*     op( A ) = A   or   op( A ) = A**T.
*  The matrix X is overwritten on B.

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Re: efficient way to solve X*A=B

Postby Julien Langou » Tue Sep 20, 2011 5:50 pm

Julien Langou
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