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XPRSchgcoltype

XPRSchgcoltype

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;
I 
indicates an integer column.
S 
indicates a semi–continuous column. The semi–continuous lower bound will be set to 1.0.
R 
indicates a semi–integer column. The semi–integer lower bound will be set to 1.0.
P 
indicates a partial integer column. The partial integer bound will be set to 1.0.
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 global search is started.
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.
3. Calling XPRSchgcoltype to change a continuous variable into an integer variable cause its lower bound to be rounded up to the nearest integer value and its upper bound to be rounded down to the nearest integer value.
Related topics
XPRSaddcols, XPRSchgrowtype, XPRSdelcols, XPRSgetcoltype.

Parent Topic Console and Library Functions

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