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<h1>set_bounds</h1>
<p>Set the lower and upper bound of a variable.</p>
<p><b>unsigned char set_bounds(lprec </b>*<i>lp</i><b>, int </b><i>column</i><b>, REAL </b><i>lower</i><b>, REAL </b><i>upper</i><b>);</b></p>
<p class="label"><b>Return Value</b></p>
<p><b>set_bounds</b> returns TRUE (1) if the operation was successful. A return
value of FALSE (0) indicates an error.<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>column</i></p>
<p class="indent">The column number of the variable on which the bounds must be
set. It must be between 1 and the number of columns in the lp.</p>
<p class="dt"><i>lower</i></p>
<p class="indent">The lower bound on the variable identified by <i>column</i>.</p>
<p class="dt"><i>upper</i></p>
<p class="indent">The upper bound on the variable identified by <i>column</i>.</p>
<p class="label"><b>Remarks</b></p>
<p>The <b>set_bounds</b> function sets a lower and upper bound on the variable
identified by <i>column</i>.<br>
Setting a bound on a variable is the way to go instead of adding an extra
constraint (row) to the model. Setting a bound doesn't increase the model size
that means that the model stays smaller and will be solved faster.<br>
Note that the default lower bound of each variable is 0. So variables will
never take negative values if no negative lower bound is set. The default upper
bound of a variable is infinity (well not quite. It is a very big number, the value of <A HREF="get_infinite.htm">get_infinite</A>).
</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, 2);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
set_bounds(lp, 1, 1.0, 2.0);
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="set_lowbo.htm">set_lowbo</A>, <A HREF="get_lowbo.htm">get_lowbo</A>,
<A HREF="set_upbo.htm">set_upbo</A>, <A HREF="get_upbo.htm">get_upbo</A>, <A HREF="set_unbounded.htm">set_unbounded</A>, <A HREF="is_unbounded.htm">is_unbounded</A>, <A HREF="is_negative.htm">is_negative</A></p>
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