append append_n_null append_null has init initSeq insert insert_n_null insert_n_null insert_null read read_all_names read_buffer_row_count read_column_count read_index read_info read_n read_n read_n_indices read_n_segments read_n_segments read_n_segments_to read_n_segments_to read_n_segments_to read_n_segments_to read_n_to read_n_to read_n_to read_n_to read_name read_row_count read_segment read_segment_to read_segment_to read_to read_to readAllNames readBufferRowCount readColumnCount readIndex readIndices readInfo readName readRowCount readSegment readSegmentSeq readSegmentSeq readSegmentSeqTo readSegmentTo readSeq readSeq readSeqTo readTo remove remove_n removeSeq rename update_name write write_n write_n write_n_segments write_n_segments write_segment writeSegment writeSegmentSeq writeSeq

read_segment() VecColumn< T, N > read_segment ( const Segment &  rows, ColumnKey  key  ) const Read the segment of a column specified by its name or index. Parameters rows The included lower and upper bounds of the row indices to be read key The name or 0-based index of the column to be read column The preexisting Column to be filled Methods to read column segments are similar to methods to read complete columns (see read()). They accept an additional parameter to specify the rows to be read, as the bounds of a closed interval. Example usages: // Create a new Column auto segment = columns.read_segment<float>({10, 50}, "NAME"); // Read into an existing Column // This is a more complex example which demonstrates the use of offsets Segment source_bounds = {10, 50}; long destination_row = 20; std::vector<float> values(100); PtrColumn<float> segment({"NAME", "m/s", 1}, 20, &values[destination_row]); columns.read_segment_to(source_bounds, "NAME", segment); See also read()