XPRSgetscaledinfeas
Purpose
Returns a list of scaled infeasible primal and dual
variables for the original problem. If the problem is currently
presolved, it is postsolved before the function returns.
Synopsis
int XPRS_CC XPRSgetscaledinfeas(XPRSprob prob, int *p_nprimalcols, int *p_nprimalrows, int *p_ndualrows, int *p_ndualcols, int x[], int slack[], int duals[], int djs[]);
Arguments
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prob
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The current problem.
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p_nprimalcols
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Number of primal infeasible variables.
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p_nprimalrows
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Number of primal infeasible rows.
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p_ndualrows
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Number of dual infeasible rows.
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p_ndualcols
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Number of dual infeasible variables.
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x
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Integer array of length
p_nprimalcols where the primal infeasible variables will be returned. May be NULL if not required.
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slack
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Integer array of length
p_nprimalrows where the primal infeasible rows will be returned. May be NULL if not required.
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duals
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Integer array of length
p_ndualrows where the dual infeasible rows will be returned. May be NULL if not required.
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djs
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Integer array of length
p_ndualcols where the dual infeasible variables will be returned. May be NULL if not required.
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Error value
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A solution is not available.
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Related controls
Double
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Tolerance on RHS.
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Reduced cost tolerance.
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Example
In this example,
XPRSgetscaledinfeas is first called with nulled integer arrays to get the number of infeasible entries. Then space is allocated for the arrays and the function is again called to fill them in.
int *x, *slack, *duals, *djs, nprimalcols, nprimalrows, ndualrows, ndualcols;
...
XPRSgetscaledinfeas(prob, &nprimalcols, &nprimalrows, &ndualrows, &ndualcols,
NULL, NULL, NULL, NULL);
x = malloc(nprimalcols * sizeof(int));
slack = malloc(nprimalrows * sizeof(int));
duals = malloc(ndualrows * sizeof(int));
djs = malloc(ndualcols * sizeof(int));
XPRSgetscaledinfeas(prob, &nprimalcols, &nprimalrows, &ndualrows, &ndualcols,
x, slack, duals, djs);
Further information
1. This function applies to linear and convex quadratic (including second order conic) problems only.
2. If any of the last four arguments are set to
NULL, the corresponding number of infeasibilities is still returned.
Related topics
XPRSgetinfeas,
XPRSgetiisdata,
XPRSiisall,
XPRSiisclear,
XPRSiisfirst,
XPRSiisisolations,
XPRSiisnext,
XPRSiisstatus,
XPRSiiswrite,
IIS.
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