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<h1>set_rh_range</h1>
<p>Set the range on a constraint.</p>
<p><b>unsigned char set_rh_range(lprec </b>*<i>lp</i><b>, int </b><i>row</i><b>, REAL </b><i>deltavalue</i><b>);</b></p>
<p class="label"><b>Return Value</b></p>
<p><b>set_rh_range</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 number of the constraint on which the range must be set.
It must be between 1 and the number of rows in the lp.</p>
<p class="dt"><i>deltavalue</i></p>
<p class="indent">The range on the constraint.</p>
<p class="label"><b>Remarks</b></p>
<p>The <b>set_rh_range</b> function sets a range on the constraint (row) identified
by <i>row</i>.<br>
Setting a range on a row is the way to go instead of adding an extra constraint
(row) to the model. Setting a range doesn't increase the model size that means
that the model stays smaller and will be solved faster.<br>
If the row has a less than constraint then the range means setting a minimum on
the constraint that is equal to the RHS value minus the range. If the row has a
greater than constraint then the range means setting a maximum on the
constraint that is equal to the RHS value plus the range.<br>
Note that the range value is the difference value and not the absolute value.
</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, 1);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
set_rh_range(lp, 1, 1.0);
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="get_rh_range.htm">get_rh_range</A></p>
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