converts ` a ' into a block matrix and call seta on the block matrix solver . concode_field_sep LinearSolver<BlockMatrix64F> alg concode_elem_sep BlockMatrix64F blockA concode_elem_sep BlockMatrix64F blockB concode_elem_sep BlockMatrix64F blockX concode_field_sep void invert concode_elem_sep void solve concode_elem_sep boolean modifiesA concode_elem_sep boolean modifiesB concode_elem_sep double quality