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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). It is recommended to add an explicit 'exists' condition in loops over sparse arrays to improve the performance of the enumeration (doesx1.mos).
Through the automatic finalization mechanism or via an explicit call to finalize a dynamic set is turned into
a constant set, all subsequently declared arrays that are indexed by this set will be created as static arrays (doesx2.mos). Further explanation of this example: 'Mosel User Guide', Section 3.3 Conditional generation
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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 resulting problem definition in Mosel end-model
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