nag_ip_mps_free (h02bvc) (PDF version)
h Chapter Contents
h Chapter Introduction
NAG C Library Manual

NAG Library Function Document

nag_ip_mps_free (h02bvc)

+ Contents

    1  Purpose
    7  Accuracy
    9  Example

1  Purpose

nag_ip_mps_free (h02bvc) frees the memory allocated by nag_ip_mps_read (h02buc).

2  Specification

#include <nag.h>
#include <nagh.h>
void  nag_ip_mps_free (double **a, double **bl, double **bu, Nag_Boolean **intvar, double **cvec, double **x)

3  Description

nag_ip_mps_free (h02bvc) should be used in conjunction with nag_ip_mps_read (h02buc), which reads data for an integer programming problem from an MPSX file, allocates several arrays, and populates them with the data contained in the file. nag_ip_mps_free (h02bvc) is a utility provided for the convenient freeing of this memory. It should be called in order to conserve memory which is no longer required, e.g., following a call to nag_ip_bb (h02bbc) (which may be used to solve the problem defined by the MPSX file). Any memory not freed will, of course, be freed when your program terminates.
nag_ip_mps_free (h02bvc) can be used to free a subset of the allocated arrays by passing null pointers for those arguments which you do not wish to free.

4  References

None.

5  Arguments

1:     adouble **Input/Output
On entry: the nonzeros of the constraint matrix A , to be freed. If a or *a is a null pointer, no action is taken.
On exit: if a is not null, *a is set to the null pointer.
2:     bldouble **Input/Output
On entry: the lower bounds of the problem variables and general constraints, to be freed. If bl or *bl is a null pointer, no action is taken.
On exit: if bl is not null, *bl is set to the null pointer.
3:     budouble **Input/Output
On entry: the upper bounds of the problem variables and general constraints, to be freed. If bu or *bu is a null pointer, no action is taken.
On exit: if bu is not null, *bu is set to the null pointer.
4:     intvarNag_Boolean **Input/Output
On entry: the indicators as to which are the integer variables in the problem, to be freed. If intvar or *intvar is a null pointer, no action is taken.
On exit: if intvar is not null, *intvar is set to the null pointer.
5:     cvecdouble **Input/Output
On entry: the coefficients, c , of the linear term of the objective function, to be freed. If cvec or *cvec is a null pointer, no action is taken.
On exit: if cvec is not null, *cvec is set to the null pointer.
6:     xdouble **Input/Output
On entry: a set of initial values for the variables, to be freed. If x or *x is a null pointer no action is taken.
On exit: if x is not null, *x is set to the null pointer.

6  Error Indicators and Warnings

None.

7  Accuracy

Not applicable.

8  Further Comments

In addition to allocating the memory freed by this function, nag_ip_mps_read (h02buc) also allocates memory to the crnames member of the options structure (if the structure is supplied as an argument). The function nag_ip_free (h02xzc) should be used to free this memory. You should not use the standard C function free() for this purpose.

9  Example

For an example of the use of nag_ip_mps_free (h02bvc) see the documentation for nag_ip_mps_read (h02buc).

nag_ip_mps_free (h02bvc) (PDF version)
h Chapter Contents
h Chapter Introduction
NAG C Library Manual

© The Numerical Algorithms Group Ltd, Oxford, UK. 2012