@pimms.value<EOL><INDENT>def native_to_vertex_matrix(native_to_voxel_matrix, voxel_to_vertex_matrix):<DEDENT>
return pimms.imm_array(np.dot(voxel_to_vertex_matrix, native_to_voxel_matrix))<EOL>
sub.native_to_vertex_matrix is the affine transformation matrix that converts from the
subject's 'native' orientation to the vertex orientation.