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<h1>is_negative</h1>
<p>Returns if the variable is negative.</p>
<p><b>unsigned char is_negative(lprec </b>*<i>lp</i><b>, int </b><i>column</i><b>);</b></p>
<p class="label"><b>Return Value</b></p>
<p><b>is_negative</b> returns TRUE (1) if the variable is defined as negative,
FALSE (0) otherwise.<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 that must be checked. It must
be between 1 and the number of columns in the lp.</p>
<p class="label"><b>Remarks</b></p>
<p>The <b>is_negative</b> function returns if a variable is negative or not.
Negative means a lower and upper bound that are both negative. Default a
variable is not free because default it has a lower bound of 0 (and an upper
bound of +infinity).
</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 negative;
/* Create a new LP model */
lp = make_lp(0, 2);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
negative = is_negative(lp, 1); /* will return 0 since the variable is not set as negative at this point */
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_upbo.htm">get_upbo</A>, <A HREF="set_upbo.htm">set_upbo</A>,
<A HREF="set_lowbo.htm">set_lowbo</A>, <A HREF="get_lowbo.htm">get_lowbo</A>, <A HREF="set_bounds.htm">
set_bounds</A>, <A HREF="is_unbounded.htm">is_unbounded</A>, <A HREF="set_unbounded.htm">set_unbounded</A></p>
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