Is there a way to express the array element operation based on index that is a variable?

Suppose I have these elements in the linear program:


param n := 10;

var idx, integer >= 1  <= n;

var arr{1..n};


What would be the simplest way to express arr[idx] (for example to use 
arr]idx] in some other statements)?


I know that this is possible. I first had "var memb{1..n}, binary;" 
instead of "idx", so that it expressed the array index as a boolean 
array instead of a single integer index, but this way it led to an 
unsolvable MIP instance.

Not even sure if this is a feasible way to simplify the MIP instance.



Thank you,

Yuri



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