test_nullspace.h

Note

The documentation on this page was automatically extracted from the DOLFIN C++ code and may need to be edited or expanded.

bool in_nullspace(const GenericLinearOperator &A, const VectorSpaceBasis &x, std::string type = "right")

Check whether a vector space basis is in the nullspace of a given operator. The string option ‘type’ can be “right” for the right nullspace (Ax=0) or “left” for the left nullspace (A^Tx = 0). To test the left nullspace, A must also be of type GenericMatrix.