On 05/04/2011 11:42 AM, Andriy Andreykiv wrote:
Hi Umut,
Regarding the assignment, probably the easiest way is:
if A and B are your matrices and you want to place a part of A into a
part of B (or the whole A into part of B, or any combinations)
do:
gmm::copy( gmm::sub_matrix(A, gmm::sub_interval(startAX, sizeAX),
gmm::sub_interval(startAY, sizeAY)),
gmm::sub_matrix(B, gmm::sub_interval(startBX,
sizeBX), gmm::sub_interval(startBY, sizeBY)) )
of course the sizes should match: sizeAXY=sizeBXY etc. .
Hi Andriy,
I could not really understand the internals of the library but there is
a general rule-of-thumb, I suppose. If you are doing a write related
operation than that should be done with copy and if you would like to do
some kind of matrix-vector multiplication then you should use csr or csc
formats where you should copy your gmm::row_matrix<
gmm::wsvector<double> > K for instance into a csr matrix. Am I right on
this?
As an experienced user, could you please comment on this?
Thanks for the above tip, by the way.
Umut
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