s the number of columns in the first line of a file.
        </li>
        <li>
          <a href = "file_name_ext_swap.m">file_name_ext_swap.m</a>,
          replaces the current "extension" of a file name.
        </li>
        <li>
          <a href = "file_row_count.m">file_row_count.m</a>,
          counts the number of row records in a file.
        </li>
        <li>
          <a href = "r8mat_data_read.m">r8mat_data_read.m</a>,
          reads a double precision table dataset from a file.
        </