standardDeviation
OPL function to return the standard deviation of an array
Purpose
OPL function to return the standard deviation of an array.
| context | type |
|---|---|
| Model files (.mod) - Not allowed in a CPLEX constraint block. |
float |
Syntax
standardDeviation(int[ ]) standardDeviation(dvar int[ ])
Description
This
function returns the standard deviation of the array. It uses the n formula, not the (n-1) one;
with the following Sn equation.
See http://mathworld.wolfram.com/StandardDeviation.html.
This function also works for integer arrays outside constraint blocks both in CP and CPLEX models. You can use this function within IBM ILOG Script statements by specifying the OPL namespace:
( Opl.xxx() )
Example
using CP;
int n = 5;
range R = 1..n;
dvar int x[R] in R;
subject to {
ct: standardDeviation(x)<=10;
}