Method rowBlock

src/util/dense_matrix.h:36–42

non-copy matrix block

  // non-copy matrix block
  virtual MatrixPtr<V> rowBlock(SizeR range) const {
    if (colMajor()) CHECK_EQ(range, SizeR(0, rows()));
    auto info = info_;
    range.to(info.mutable_row());
    info.set_nnz(range.size() * cols());
    return MatrixPtr<V>(new DenseMatrix<V>(info, value_.segment(range*cols())));
  }

  virtual MatrixPtr<V> colBlock(SizeR range) const {
    if (rowMajor()) CHECK_EQ(range, SizeR(0, cols()));