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<h1>set_epsint</h1>
<p>Specifies the tolerance that is used to determine whether a floating-point number
is in fact an integer.</p>
<p><b>void set_epsint(lprec </b>*<i>lp</i><b>, REAL </b><i>epsint</i><b>);</b></p>
<p class="label"><b>Return Value</b></p>
<p><b>set_epsint</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>epsint</i></p>
<p class="indent">The tolerance that is used to determine whether a floating-point
number is in fact an integer.</p>
<p class="label"><b>Remarks</b></p>
<p>The <b>set_epsint</b> function specifies the tolerance that is used to determine
whether a floating-point number is in fact an integer. This is only used when
there is at least one integer variable and the branch and bound algorithm is
used to make variables integer.<br>
Integer variables are internally in the algorithm also stored as floating
point. Therefore a tolerance is needed to determine if a value is to be considered
as integer or not. If the absolute value of the variable minus the closed
integer value is less than <i>epsint</i>, it is considered
as integer. For example if a variable has the value 0.9999999 and epsint
is 0.000001 then it is considered integer because abs(0.9999999 - 1) =
0.0000001 and this is less
than 0.000001<br>
The default value for <i>epsint</i> is 1e-7<br>
So by changing epsint you determine how close a value must approximate the
nearest integer. Changing this tolerance value to for example 0.001 will
generally result in faster solving times, but your solution is less integer.<BR>
So it is a compromise.<BR>
</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_epsint(lp, 1.0e-3); /* sets epsint to 0.001 */
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_epsint.htm">get_epsint</A>, <A href="set_infinite.htm">set_infinite</A>, <A href="is_infinite.htm">is_infinite</A>,
<A href="get_infinite.htm">get_infinite</A>, <A href="set_epsb.htm">set_epsb</A>,
<A href="get_epsb.htm">get_epsb</A>, <A href="set_epsd.htm">set_epsd</A>, <A href="get_epsd.htm">
get_epsd</A>, <A href="set_epsel.htm">set_epsel</A>, <A href="get_epsel.htm">get_epsel</A>, <A href="get_epspivot.htm">get_epspivot</A>, <A href="set_epspivot.htm">set_epspivot</A>, <A href="set_epsperturb.htm">set_epsperturb</A>, <A href="get_epsperturb.htm">get_epsperturb</A>, <A HREF="set_mip_gap.htm">set_mip_gap</A>, <A HREF="get_mip_gap.htm">get_mip_gap</A></p>
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