NAG C Library Function Document

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: $a$ – double **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: $bl$ – double **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: $bu$ – double **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: $intvar$ – Nag_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: $cvec$ – double **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: $x$ – double **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

Parallelism and Performance

nag_ip_mps_free (h02bvc) is not threaded in any implementation.

9

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.