[Boost-users] Re: ublas and matrix expression

Angus Leeming wrote:

Hi, Russell.

You are trying to solve a matrix expression.

A = B^-1 * C*D is equivalent to B*A = B*B^-1 * C*D which collapses to B*A = C*D

So, you can reprase your problem as solve the system B*A = E where B,E are known, E=C*D, to give the unknown A.

Have a look at the (undocumented :-() lu_factorize and lu_substitute routines. They should enable you to complete the task.

Thanks, where are these methods defined? I'm using 1.30.2 and have searched the ublas directory for files with lu_factorize in and can't find it. Thanks Russell