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<h1>set_constr_type</h1>
<p>Set the type of a constraint.</p>
<p><b>unsigned char set_constr_type(lprec </b>*<i>lp</i><b>, int </b><i>row</i><b>, int </b><i>con_type</i><b>);</b></p>
<p class="label"><b>Return Value</b></p>
<p><b>set_constr_type</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>row</i></p>
<p class="indent">The row for which the constraint type must be set. Must be
between 1 and number of rows in the lp.</p>
<p class="dt"><i>con_type</i></p>
<p class="indent">The type of the constraint. Can by any of the following values:</p>
<TABLE id="Table2" cellSpacing="1" cellPadding="1" width="100%" border="1">
<TR>
<TD>LE (1)</TD>
<TD>Less than or equal (<=)</TD>
</TR>
<TR>
<TD>EQ (3)</TD>
<TD>Equal (=)</TD>
</TR>
<TR>
<TD>GE (2)</TD>
<TD>Greater than or equal (>=)</TD>
</TR>
<TR>
<TD>FR (0)</TD>
<TD>Free</TD>
</TR>
</TABLE>
<p class="label"><b>Remarks</b></p>
<p>The <b>set_constr_type</b> function sets the constraint type for the specified
row.<br>
The default constraint type is LE.<br>
Note the free (FR) constraint type. This is new from version 5.1.0.1<br>
A free constraint will act as if the constraint is not there.
The lower bound is -Infinity and the upper bound is +Infinity.<br>
This can be used to temporary disable a constraint without having to delete it from
the model. Note that the already set RHS and range on this constraint is overruled with
Infinity by this.
</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(1, 0);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
set_constr_type(lp, 1, GE);
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_constr_type.htm">get_constr_type</A>, <A HREF="is_constr_type.htm">is_constr_type</A>, <A HREF="add_constraint.htm">
add_constraint, add_constraintex, str_add_constraint</A>, <A HREF="del_constraint.htm">del_constraint</A></p>
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