selectRandomWeighted

1.76

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Description

Description:

Returns a random element from the given array according to assigned weights. Engine solution to BIS_fnc_selectRandomWeighted. A few notes:

• Negative weights are not supported
• If an item's weight is 0, the item is ignored
• The weights don't have to total to 1
• If numbers of items and weights do not match, the shortest array is used
• A single array Syntax is slightly faster then Alt Syntax

Groups:

Arrays

Syntax

Syntax:

selectRandomWeighted valuesAndWeights

Parameters:

valuesAndWeights: Array - array in format [value1, weight1, value2, weight2...], where:

• value: Anything - weighted value
• weight: Number - values relative weight

Return Value:

Anything - random weighted value or Nothing if array is empty or all weights are 0

Alternative Syntax

Syntax:

values selectRandomWeighted weights

Parameters:

values: Array - array of Anything

weights: Array - array of Numbers

Return Value:

Anything - random weighted value or Nothing if any of arrays is empty or all weights are 0

Examples

Example 1:

_randomWeightedElement = selectRandomWeighted [1,0.1,2,0.2,3,1.3,4,2.4,5,7.5];

Example 2:

_randomWeightedElement = [1,2,3,4,5] selectRandomWeighted [0.1,0.2,1.3,2.4,7.5];

Additional Information

See also:

randomselectselectRandomselectMinselectMax

Notes

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Only post proven facts here! Add Note

Posted on June 26, 2017 - 19:17 (UTC)

Killzone Kid

A 100000 runs of the following code: _values = [0,1,2,3,4,5,6,7,8,9]; _weights = [0.109,0.65,0.01,1.01,1.24,0,1.59,0.09,1.15,0.55]; _result = _values selectRandomWeighted _weights; Gave this result:

0 - 0
0.01 - 144
0.09 - 1409
0.109 - 1633
0.55 - 8673
0.65 - 10127
1.01 - 15668
1.15 - 18059
1.24 - 19518
1.59 - 24769