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<h1>get_lambda, get_ptr_lambda</h1>
<p>Returns the Lamdba vectors (Lagrangian optimization).</p>
<p><b>unsigned char get_lambda(lprec </b>*<i>lp</i><b>, REAL </b>*<i>lambda</i><b>);</b></p>
<p><b>unsigned char get_ptr_lambda(lprec </b>*<i>lp</i><b>, REAL </b>**<i>ptr_lambda</i><b>);</b></p>
<p class="label"><b>Return Value</b></p>
<p><b>get_lambda, get_ptr_lambda</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>lambda</i></p>
<p class="indent">An array that will contain the values of the Lamdba vectors.</p>
<p class="dt"><i>ptr_lambda</i></p>
<p class="indent">The address of a pointer that will point to an array that will
contain the values of the Lamdba vectors.</p>
<p class="label"><b>Remarks</b></p>
<p>The <b>get_lambda</b>, <b>get_ptr_lambda</b> functions retrieve the Lamdba
vectors.<br>
These values are only valid after a successful <A href="lag_solve.htm">lag_solve</A>.
Function <b>get_lambda</b> needs an array that is already dimensioned with <A href="get_Lrows.htm">
get_Lrows</A> elements. <b>get_ptr_lambda</b> returns a pointer to an array
already dimensioned by lp_solve.
</p>
<p>Note that <b>get_ptr_lambda</b> returns a pointer to memory allocated and maintained
by lp_solve. Be careful what you do with it. Don't modify its contents or free the memory.
Unexpected behaviour would occur. Also note that this memory pointer is only guaranteed to
remain constant until a next lp_solve API call is done. You should call this function again
to make sure you have again the correct pointer. Otherwise, this pointer could point to invalid
memory. This should not be a problem since this call is very efficient.</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 ret;
REAL row[1+2]; /* must be 1 more than number of columns ! */
REAL *ptr_lambda, lambda[1];
/* Create a new LP model */
lp = make_lp(0, 0);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
row[1] = 1.0;
row[2] = 1.0;
add_lag_con(lp, row, LE, 1.0);
ret = lag_solve(lp, 0, 30, FALSE);
get_lambda(lp, lambda);
get_ptr_lambda(lp, &ptr_lambda);
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="is_feasible.htm">is_feasible</a>, <A HREF="get_objective.htm">
get_objective</A>, <A HREF="get_working_objective.htm">get_working_objective</A>, <a href="get_variables.htm">get_variables, get_ptr_variables</a>,
<a href="get_primal_solution.htm">get_primal_solution, get_ptr_primal_solution, get_var_primalresult</a>,
<a href="get_sensitivity_rhs.htm">
get_sensitivity_rhs, get_ptr_sensitivity_rhs, get_dual_solution,
get_ptr_dual_solution, get_var_dualresult</a>, <a href="get_sensitivity_obj.htm">get_sensitivity_obj,
get_ptr_sensitivity_obj, get_sensitivity_objex, get_ptr_sensitivity_objex</a>,
<a href="get_constraints.htm">get_constraints, get_ptr_constraints</a>, <a href="get_constr_value.htm">get_constr_value</a>, <a href="lag_solve.htm">
lag_solve</a>
</p>
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