DOLFIN

Declare a dolfin::matrix with size mxn

Asked by Nguyen Van Dang

Hello,

I would like to create a dolfin matrix with the size n
ex: dolfin::Matrix X(10, 10);
in c++ version.
I installed fenics recently but I can not declare like this. When I declared
dolfin::Matrix X;
I can compiled it without error. However, I can not run it. I took a look in http://dolfin.sourcearchive.com/documentation/0.9.8-1/Matrix_8h-source.html. Obviously, we can declare the dolfin matrix with a given size. Please help me.

Best regards

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Garth Wells (garth-wells) said : 		#1

dolfin::Matrix is a sparse matrix, so is in general incomplete without a sparsity pattern. The Matrix(M, N) constructor throws an error in the most recent release.

Try using dolfin::uBLASSparseMatrix or dolfin::uBLASDenseMatrix.

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