ILOG OPL Development Studio Language Reference Manual

ArraysArrays are fundamental in many applications.One-dimensional arraysOne-dimensional arrays are the simplest arrays in OPL and vary according to the type of theirelements and index sets. A declaration of the formint a[1..4] = [10, 20, 30, 40];declares an array of four integers a[1],...,a[4] whose values are 10, 20, 30, and 40.It is of course possible to define arrays of other basic types. For instance, the instructionsint a[1..4] = [10, 20, 30, 40];float f[1..4] = [1.2, 2.3, 3.4, 4.5];string d[1..2] = [“Monday”, “Wednesday”];declare arrays of natural numbers, floats, and strings, respectively.The index sets of arrays in OPL are very general and can be integer ranges and arbitrary finitesets. In the examples so far, index sets were given explicitly, but it is possible to use apreviously defined range, as inrange R = 1..4;int a[R] = [10, 20, 30, 40];The declaration:int a[Days] = [10, 20, 30, 40, 50, 60, 70];describes an array indexed by a set of strings; its elements are a[“Monday”],...,a[“Sunday”].Arrays can also be indexed by finite sets of arbitrary types. This feature is fundamental inOPL to exploit sparsity in large linear programming applications, as discussed in detail inExploiting sparsity in the Language User’s Manual.For example, the declaration:tuple Edges {int orig;int dest;}24I L O G O P L D E V E L O P M E N T S T U D I O L A N G U A G ER E F E R E N C E M A N U A L