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<h1>write_basis</h1>
<p>
Writes current basis to a file.</p>
<P><B>unsigned char write_basis(lprec </b>*<i>lp</i>, <b>char </B>*<I>filename</I><B>);</B></P>
<p class="label">
<b>Return Value</b></p>
<p>Returns TRUE if basis could be written to <i>filename</i> and FALSE if not.<br>
A FALSE return value indicates an error. Specifically file could not be
opened or not able to write in file.</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>filename</I></P>
<P class="indent">
Filename to write the basis to.</p>
<p class="label">
<b>Remarks</b></p>
<P>
The <b>write_basis</b> function writes the current basis to <i>filename</i>.<br>
This basis can later be reused by <A HREF="read_basis.htm">read_basis</A> to reset a basis.
Setting an initial basis can speed up the solver considerably. It is the
starting point from where the algorithm continues to find an optimal solution.<br>
When a restart is done, lp_solve continues at the last basis, except if <A HREF="set_basis.htm">
set_basis</A>, <A HREF="default_basis.htm">default_basis</A>, <a href="guess_basis.htm">guess_basis</a> or <A HREF="read_basis.htm">read_basis</A> is called.
</P>
<P>
The basis in the file is written in <a href="bas-format.htm">MPS bas file format</a>.
</P>
<P>
When filename is NULL, then output is written to output set by
<A href="set_output.htm">set_outputstream, set_outputfile</A>. By default this is stdout.
</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;
int ret;
/* Read LP model */
lp = read_LP("model.lp", NORMAL, "test model");
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
ret = solve(lp);
ret = write_basis(lp, "model.bas", NULL);
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_basis.htm">get_basis</A>, <A HREF="set_basis.htm">set_basis</A>, <A HREF="default_basis.htm">default_basis</A>, <A HREF="read_basis.htm">read_basis</A>, <a href="guess_basis.htm">guess_basis</a>, <A HREF="get_basiscrash.htm">get_basiscrash</A>, <A HREF="set_basiscrash.htm">set_basiscrash</A></p>
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