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<h1>set_maxpivot</h1>
<p>Sets the maximum number of pivots between a re-inversion of the matrix.</p>
<p><b>void set_maxpivot(lprec </b>*<i>lp</i><b>, int </b><i>max_num_inv</i><b>);</b></p>
<p class="label"><b>Return Value</b></p>
<p><b>set_maxpivot</b> has no return value.<br>
</p>
<p class="label"><b>Parameters</b></p>
<p class="dt"><i>lp</i></p>
<p class="indent">Pointer to previously created lp model. See return value of <A href="make_lp.htm">
make_lp</A>, <A HREF="copy_lp.htm">copy_lp</A>, <A href="read_lp.htm">read_lp,
read_LP</A>, <A href="read_mps.htm">read_mps, read_freemps, read_MPS, read_freeMPS</A>, <A HREF="read_XLI.htm">read_XLI</A></p>
<p class="dt"><i>max_num_inv</i></p>
<p class="indent">The maximum number of pivots between a re-inversion of the matrix.</p>
<p class="label"><b>Remarks</b></p>
<p>The <b>set_maxpivot</b> function sets the maximum number of pivots between a
re-inversion of the matrix.<br>
For stability reasons, lp_solve re-inverts the matrix on regular times. <i>max_num_inv</i>
determines how frequently this inversion is done. This can influence numerical stability. However, the more often this is done, the slower the solver becomes.
<br>
The default is 250 for the LUSOL bfp and 42 for the other BFPs.
</p>
<p class="label"><b>Example</b></p>
<pre><code>#include <stdio.h>
#include <stdlib.h>
#include "lp_lib.h"
int main(void)
{
lprec *lp;
/* Create a new LP model */
lp = make_lp(0, 0);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
set_maxpivot(lp, 10);
delete_lp(lp);
return(0);
}
</code></pre>
<p>
<A HREF="lp_solveAPIreference.htm">lp_solve API reference</A></p>
<p>
<b>See Also</b> <A HREF="make_lp.htm">make_lp</A>, <A HREF="copy_lp.htm">copy_lp</A>,
<A href="read_lp.htm">read_lp, read_LP</A>, <A HREF="read_mps.htm">read_mps,
read_freemps, read_MPS, read_freeMPS</A>, <A HREF="read_XLI.htm">read_XLI</A>, <A HREF="get_maxpivot.htm">get_maxpivot</A></p>
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