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.

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XPRSchgcoltype

XPRSchgcoltype