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<h1>make_lp</h1>
<p>
Create and initialise a new lprec structure.</p>
<p>
<b>lprec *make_lp(int </b><i>rows</i><b>, int </b><i>columns</i><b>);</b></p>
<p class="label">
<b>Return Value</b></p>
<p>
Returns a pointer to a new lprec structure. This must be provided to almost all
lp_solve functions.<br>
A <b>NULL</b> return value indicates an error. Specifically not enough memory
available to setup an lprec structure.</p>
<p class="label">
<b>Parameters</b></p>
<p class="dt">
<i>rows</i></p>
<p class="indent">
Initial number of rows. Can be 0 as new rows can be added via <A href="add_constraint.htm">
add_constraint, add_constraintex, str_add_constraint</A></p>
<p class="dt">
<i>columns</i></p>
<p class="indent">
Initial number of columns. Can be 0 as new columns can be added via <A href="add_column.htm">
add_column, add_columnex, str_add_column</A></p>
<p class="label">
<b>Remarks</b></p>
<p>
The <b>make_lp</b> function constructs a new LP. Sets all variables to initial
values.<br>
The LP has <i>rows</i> rows and <i>columns</i> columns. The matrix contains no
values, but space for one value. All arrays that depend on <i>rows</i> and <i>columns</i>
are allocated.<br>
<br>
It is advised not to read/write the lprec structure. Instead, use the function
interface to communicate with the lp_solve library. This because the structure
can change over time. The function interface will be more stable.
</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);
}
/* Model created */
/*
.
.
.
*/
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="copy_lp.htm">copy_lp</A>, <A HREF="delete_lp.htm">delete_lp</A>, <A HREF="free_lp.htm">free_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="resize_lp.htm">resize_lp</A></p>
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