throws DimensionMismatchException { try { return multiply((BlockRealMatrix) m); } catch (ClassCastException cce) {
throws DimensionMismatchException { if (m instanceof BlockRealMatrix) { return multiply((BlockRealMatrix) m); } else {
RealMatrix delts = xs.subtract(new BlockRealMatrix(ones).multiply(mus)); // N x n
throws DimensionMismatchException { try { return multiply((BlockRealMatrix) m); } catch (ClassCastException cce) {