Purpose
Used to change the type of a column in the matrix.
Synopsis
int XPRS_CC XPRSchgcoltype(XPRSprob prob, int nels, const int mindex[], const char qctype[]);
Arguments
|
prob
|
The current problem.
|
|
nels
|
Number of columns to change.
|
|
mindex
|
Integer array of length nels containing the indices of the columns.
|
|
qctype
|
Character array of length nels giving the new column types:
|
C
|
indicates a continuous column;
|
|
B
|
indicates a binary column;
|
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I
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indicates an integer column.
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|
Example
The following changes columns 3 and 5 of the matrix to be integer and binary respectively:
mindex[0] = 3; mindex[1] = 5;
qctype[0] = "I"; qctype[1] = "B";
XPRSchgcoltype(prob,2,mindex,qctype);
Further information
1. The column types can only be changed before the MIP search is started. If
XPRSchgcoltype is called after a problem has been presolved, the presolved column numbers
must be supplied. It is not possible to change a column into a partial integer, semi-continuous or
semi-continuous integer
variable.
2. Calling XPRSchgcoltype to change any variable into a binary variable
causes the bounds previously defined for the variable to be deleted and replaced by bounds of 0 and
1.
Related topics
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