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| Purpose |
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Change the sense of a set of constraints.
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| Synopsis |
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int QSchange_senses (QSprob p, int num, int *rowlist, char *sense)
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| Arguments |
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p |
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a handle to an initialized problem. |
num |
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the number of constraints to be changed. |
rowlist |
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an array of length num specifying the indices of the constraints to be changed. |
sense |
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an array of length num specifying the new sense of each of the constraints; entries should be 'E', 'L', or 'G'. |
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| Returns |
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A zero value if the function terminated correctly, and a non-zero value if an error occurred.
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| Description |
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The sense of each constraint in an LP problem is either ≥ , = , or ≤ . This function can be used to change the sense of each constraint in a given list, specifying new values using the encoding 'E' for ≥ , 'L' for = , and 'G' for ≤ . To change the sense of a single constraint it is easier to use the function QSchange_sense.
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| Example |
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/* Assume p is initialized to the problem in the QSload_prob example. */
/* Change the first constraint to an "=" and change the second */
/* constraint to a "<=". */
int rval;
int rowlist[2] = { 0, 1 };
char sense[2] = { 'E', 'L' };
rval = QSchange_senses (p, 2, rowlist, sense);
if (rval) {
fprintf (stderr,
"Could not change the senses, error code %d\n",rval);
}
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