Initializing help system before first use

create

Purpose
Create explicitly a cell of a dynamic array.
Synopsis
procedure create(x:array reference)
procedure create(u:union reference)
Arguments
x 
Cell to be created
u 
Union to initialize
Example
The following declares a dynamic array of variables, creating only those corresponding to the odd indices. It also initializes a union as a decision variable. Finally, it defines the linear expression ux + x(1) + x(3) + x(5) + x(7): 
declarations
 x: dynamic array(1..8) of mpvar
 ux: any
end-declarations

create(ux.mpvar)
forall(i in 1..8| isodd(i)) create(x(i))
C:= ux.mpvar + sum(i in 1..8) x(i)
Further information
1. Usually cells of dynamic arrays are created by means of assignments. This procedure can be used as a replacement for an assignment, in particular when the type of a dynamic array does not provide any assignment operator (like mpvar for instance).
2. In a similar way as for an array cell the create procedure may be used to initialize and set the type of a union. If the union has already the requested type no operation if performed, otherwise the current value is deleted and the new type is assigned to the entity (in association with the corresponding default value).
Related topics
Section Arrays, Section Unions, reset, delcell.

Parent Topic Predefined functions and procedures

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