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Purpose |
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Copy the basis and dual steepest-edge norms.
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Synopsis |
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int QSget_basis_and_row_norms_array (QSprob p, char *cstat,
char *rstat, double *rownorms)
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Arguments |
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p |
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a handle to an initialized problem. |
cstat |
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returns an array specifying the status of each column (variable) in the basis; this field can be NULL , if it is not NULL it should point to an array of length at least ncols , the number of columns in the problem. |
rstat |
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returns an array specifying the status of each row (constraint) in the basis; this field can be NULL , if it is not NULL it should point to an array of length at least nrows , the number of rows in the problem. |
rownorms |
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returns an array specifying the dual steepest-edge norm of each row (constraint); this field can be NULL , if it is not NULL it should point to an array of length at least nrows . |
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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 basis information is returned in the arrays cstat and rstat , using the encoding given above in the description of QSget_basis_array; the row norms are given as floating point numbers in the array rownorms . It is important note that the row norms correspond to the particular basis, so the basis and row norms should be stored together if they are to be used in a later call to QSload_basis_and_row_norms_array.
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Example |
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/* p is an initialized QSprob, a handle to an existing LP problem */
int rval, ncols, nrows;
char *cstat, *rstat;
double *rownorms;
ncols = QSget_colcount (p);
nrows = QSget_rowcount (p);
cstat = (char *) malloc (ncols * sizeof (char));
rstat = (char *) malloc (nrows * sizeof (char));
rownorms = (double *) malloc (nrows * sizeof (char));
rval = QSget_basis_and_row_norms_array (p, cstat, rstat, rownorms);
if (rval) {
fprintf (stderr,
"Could not get the basis+norms, error code %d\n", rval);
} else {
/* The basis and norm information is stored in the arrays. */
}
free (cstat);
free (rstat);
free (rownorms);
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