XPRSchgbounds
XPRSchgbounds |
Purpose
Synopsis
int XPRS_CC XPRSchgbounds(XPRSprob prob, int nbnds, const int mindex[], const char qbtype[], const double bnd[]);
Arguments
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prob
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The current problem.
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nbnds
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Number of bounds to change.
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mindex
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Integer array of size
nbnds containing the indices of the columns on which the bounds will change.
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qbtype
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Character array of length
nbnds indicating the type of bound to change:
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bnd
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Double array of length
nbnds giving the new bound values.
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Example
The following changes column
0 of the current problem to have an upper bound of
0.5:
mindex[0] = 0; qbtype[0] = 'U'; bnd[0] = 0.5; XPRSchgbounds(prob,1,mindex,qbtype,bnd);
Further information
1. A column index may appear twice in the
mindex array so it is possible to change both the upper and lower bounds on a variable in one go.
2.
XPRSchgbounds may be applied to the problem in a presolved state, in which case it expects references to the presolved problem.
3. The double constants
XPRS_PLUSINFINITY and
XPRS_MINUSINFINITY defined in the library header file can be used to represent plus and minus infinity respectively in the bound (
bnd) array.
4. If the upper bound on a binary variable is changed to be greater than 1 or the lower bound is changed to be less than 0 then the variable will become an integer variable.
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