pivot

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pivot

$\begin{usage} pivot(a, p, c, r) \end{usage}$

Signature

pivot: (M,Z $\to$ Z, Z, Z) $\to$ Z

where
Z == MachineInteger

$\begin{params} {\em a} & M & A matrix\\ {\em p} &\htmlref{\texttt{MachineInte... ...htmlref{\texttt{MachineInteger}}{MachineInteger} & A row index\\\end{params}$

$\begin{retval} Returns the row index of the an appropriate pivot for column $c$... ...elow. The matrix considered is $a$\ with its rows permuted by $p$. \end{retval}$

Manuel Bronstein 2000-12-13