{* *! version 1.0.0  16mar2007}{...}
    {cmd:rowsof(}{it:M}{cmd:)}
{p2colset 8 22 26 2}{...}
{p2col: Domain:}matrices{p_end}
{p2col: Range:}integer scalars 1 to {cmd:matsize}{p_end}
{p2col: Description:}returns the number of rows of {it:M}.{p_end}
{p2colreset}{...}
