M</var>)</i>
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</dt>
<dt><u>Function:</u> <b>read_matrix</b><i> (<var>S</var>, <var>separator_flag</var>)</i>
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</dt>
<dt><u>Function:</u> <b>read_matrix</b><i> (<var>S</var>, <var>M</var>, <var>separator_flag</var>)</i>
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</dt>
<dd><p><code>read_matrix(<var>S</var>)</code> reads the source <var>S</var> and returns its entire content as a matrix.
The size of the matrix is inferred from the input data;
each line of the file becomes one row of the