On 09/18/2016 10:01 AM, 'Franck Kalala' via deal.II User Group wrote:
How to perform the matrix multiplication
A*diag(V)
where diag(V) is a diagonal matrix with the vector V in the main diagonal.
is there any such function in dealii?
how to create the SparseMatrix diag(V) for a given vector V?
to my knowledge dealii on provided
A.mmult(C,B,V) for C= A*diag(V)*B or
A.mmult(C,B) for C= A*B
Do you actually need to form the product matrix? Or are you only interested in
*applying* this matrix to vectors?
In the latter case, the operation
diag(V) * vec
can be achieved using the Vector::scale() function.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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