Initializing help system before first use

distance

distance

Purpose
This constraint specifies the distance between two variables.
Synopsis
function distance(x:cpvar, y:cpvar) : 0cpabs
Argument
x,y 
finite domain variables
Return value
An absolute value constraint over x and y corresponding to the expressed distance constraint: |x-y|
Example
The following example shows how to use the distance constraint 
model "Distance constraints"
 uses "kalis"

 setparam("KALIS_DEFAULT_LB", -50); setparam("KALIS_DEFAULT_UB", 50)

 declarations
  x, y, z: cpvar
  Dist: cpctr
 end-declarations

 setname(x,"x")
 setname(y,"y")
 setname(z,"z")

 abs(x) = y
 writeln("Absolute value of x: ", x,y,z)

 y >= 20
 writeln("Bounding y by 20: ", x,y,z)

! abs(y-z) <= 3
! Equivalent version of this constraint:
 distance(y,z) <= 3

 writeln("Max distance betw. y and z: ", x,y,z)

 Dist:= distance(x,z) = 5

 if(cp_post(Dist)) then
  writeln("Distance between x and z: ", x,y,z)
 else
  writeln("Problem is infeasible")
 end-if

 cp_show_prob

end-model

Related topics
abs

Parent Topic Constraints

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