problem.chgbounds
problem.chgbounds |
Purpose
Changes the bounds on columns in the problem.
Synopsis
problem.chgbounds (mindex, qbtype, bnd)
Arguments
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mindex
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Array containing the indices of the columns on which the bounds will change.
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qbtype
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Character array indicating the type of bound to change:
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bnd
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Array giving the new bound values.
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Example
The following changes the lower bound of variable
v1 to 2, upper bound of variable
v2 to 5, and fixes variable
v3 to 3:
p.chgbounds ([v1,v2,v3],['L','U','B'],[2,5,3])
Further information
1. A column 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.
chgbounds may be applied to the problem in a presolved state, in which case it expects references to the presolved problem.
3. The double constant
xpress.infinity can be used to represent plus and minus infinity 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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