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getslack

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Purpose

Return the slack value of a general constraint

Synopsis

function getslack(c:genctr) :real

Argument

c	a general constraint

Return value

The slack value of the constraint, or zero if the constraint is not part of the current problem.

Example

The following example solves a problem and retrieves the slack value of a constraint:

declarations
  c1, c2: genctr
  x, y: mpvar
end-declarations

  x <= 10
  y <= 10
  c1:= x^2 + y^2 <= 4 - x
  c2:= x*y >= 1
 
  SLPloadprob(x+y)
  SLPmaximize
  writeln("c1 slack value=",getslack(c1))

Further information

This function returns the slack value of the constraint if the problem has been solved successfully and the constraint is in the problem, or zero otherwise.

Related topics

getact, getdual, getsol

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