e04myc should be used in conjunction with e04mzc, which reads data for a sparse linear or quadratic programming problem from an MPSX file, allocates several arrays, and initializes them with the data contained in the file. e04myc 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 e04nkc (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.

e04myc 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 sparse 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: $ha$ – Integer ** Input/Output: On entry: the row indices of the nonzero elements stored in a, to be freed. If ha or *ha is a null pointer, no action is taken.

On exit: if ha is not null, *ha is set to the null pointer.
3: $ka$ – Integer ** Input/Output: On entry: the indices indicating the beginning of each column of $A$ , to be freed. If ka or *ka is a null pointer, no action is taken.

On exit: if ka is not null, *ka is set to the null pointer.
4: $bl$ – 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.
5: $bu$ – 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.
6: $xs$ – double ** Input/Output: On entry: a set of initial values for the variables and constraints, to be freed. If xs or *xs is a null pointer no action is taken.

On exit: if xs is not null, *xs is set to the null pointer.

6 Error Indicators and Warnings

None.

7 Accuracy

Not applicable.

8 Parallelism and Performance

Background information to multithreading can be found in the Multithreading documentation.

e04myc is not threaded in any implementation.

9 Further Comments

In addition to allocating the memory freed by this function, e04mzc also allocates memory to the

crnames

member of the options structure (if the structure is supplied as an argument). The function e04xzc should be used to free this memory. You must not use the standard C function free() for this purpose.