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Conditional creation of decision variables

Description
If an array of decision variables of type mpvar is created as a dynamic array then its entries must be created explicitly using the subroutine create (doesx.mos). Using finalize it is possible to turn a dynamic set into a constant set (doesx2.mos).

Further explanation of this example: 'Mosel User Guide', Section 3.3 Conditional generation


Source Files

Data Files





doesx.mos

(!******************************************************
   Mosel User Guide Example Problems
   ================================= 

   file doesx.mos
   ``````````````
   Working with dynamic arrays of variables.
   
   (c) 2008 Fair Isaac Corporation
       author: Bob Daniel, 2001, rev. Sep. 2018
*******************************************************!)

model doesx
 public declarations
  IR = 1..15
  WHICH: set of integer
  x: dynamic array(IR) of mpvar
  Obj,C: linctr
 end-declarations

! Read data from file
 initializations from 'doesx.dat'
  WHICH
 end-initializations

! Create the x variables that exist
 forall(i in WHICH) create(x(i))

! Build a little model to show what esists
 Obj:= sum(i in IR) x(i)
 C:= sum(i in IR) i * x(i) >= 5

 exportprob(0, "", Obj)               ! Display the model
end-model

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