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getdual

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Purpose

Returns the dual solution value of a general constraint

Synopsis

function getdual(c:genctr) :real

Argument

c	a general constraint

Return value

The dual solution value of the constraint, or zero if the problem has not been optimized or the constraint is not part of the current problem.

Example

The following example solves a problem and retrieves the dual 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 dual value=",getdual(c1))

Related topics

getact, getslack, getsol

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