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span


\begin{usage}
span~a\\ span!~a
\end{usage}


Signature


\begin{params}
{\em a} & M & A matrix whose span has to be computed
\end{params}

\begin{retval}
Returns $[c_1,\dots,c_r]$\ where $r$\ is the rank of {\em a}
and the span of $a$\ is generated by its columns $c_1,\dots,c_r$.
\end{retval}

\begin{remarks}
span!~does not make a copy of $a$, but performs all the
computations in--place, modifying the entries of $a$.
\end{remarks}


See Also



Manuel Bronstein 2000-12-13