setrange
setrange |
Purpose
Set the domain range of a constraint.
Synopsis
procedure setrange(c:linctr, lb:real, ub:real)
Arguments
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c
|
A linear constraint expression
|
|
lb
|
Lower bound
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ub
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Upper bound
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Example
The following sets the domain of the
x variable and defines
c as a range constraint.
declarations x,y,z: mpvar c: linctr end-declarations c:= 2*y+4*z+5 setrange(x,3,10) ! 3<=x<=10 setrange(c,1,30) ! -4<=2*y+4*z<=25
Further information
1. If the parameter
c is a linear expression a new anonymous range constraint is added to the problem. Otherwise, the provided constraint is turned into a range constraint (and added to the problem if required).
2. This procedure changes the type of the provided constraint to
CT_RNG, stores the provided lower bound as an external information and records the upper bound as the constant term of the constraint. As a consequence defining the range of a constraint modifies its constant term, this has to be taken into account if a range constraint is converted to another type or used as part of a linear expression.