get_variables, get_ptr_variables

Returns the values of the variables.

unsigned char get_variables(lprec *lp, REAL *var);

unsigned char get_ptr_variables(lprec *lp, REAL **ptr_var);

Return Value

get_variables, get_ptr_variables returns TRUE (1) if the operation was successful. A return value of FALSE (0) indicates an error.

Parameters

Pointer to previously created lp model. See return value of make_lp, read_lp, read_LP, read_mps, read_freemps, read_MPS, read_freeMPS, read_XLI

var

An array that will contain the values of the variables.

ptr_var

The address of a pointer that will point to an array that will contain the values of the variables.

Remarks

The get_variables, get_ptr_variables functions retrieve the values of the variables.
These values are only valid after a successful solve or lag_solve. Function get_variables needs an array that is already dimensioned with get_Ncolumns elements. get_ptr_variables returns a pointer to an array already dimensioned by lp_solve. Element 0 will contain the value of the first variable, element 1 of the second variable, ...

Note that get_ptr_variables 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.

Example

#include <stdio.h>
#include <stdlib.h>
#include "lp_lib.h"

int main(void)
{
  lprec *lp;
  REAL var[2], *ptr_var;

  /* Create a new LP model */
  lp = make_lp(0, 2);
  if(lp == NULL) {
    fprintf(stderr, "Unable to create new LP model\n");
    return(1);
  }

  solve(lp);

  get_variables(lp, var);
  get_ptr_variables(lp, &ptr_var);

  delete_lp(lp);
  return(0);
}

lp_solve API reference