Difference between revisions of "Shuffle"
Line 24: | Line 24: | ||
To generate a random permutation of the numbers 1..100: | To generate a random permutation of the numbers 1..100: | ||
− | Index I:=1..100 | + | Index I:=1..100; |
+ | Shuffle(I,I) |
Revision as of 19:48, 2 April 2008
What's new in Analytica 4.0? >
Function Shuffle(a , i)
Shuffle returns a random reordering (permutation) of the values in array a over index i. If you omit i, by default it shuffles over Run -- i.e. it shuffles a random sample. You can use it generate an independent random sample from an existing probability distribution, a.
Independent Shuffles
If a contains extra dimensions, or if you include the Over parameter, e.g.:
- Shuffle(a,I,Over:J)
then the elements are shuffled independently over those extra dimensions.
If you want to shuffle the slices of a multidimensional array over index i, without shuffling the values within each slice, use this method:
A[@I = Shuffle(@I,I)]
This shuffles A over index I, but does not shuffle each slice of A for each value of I.
Examples
To generate a random permutation of the numbers 1..100:
Index I:=1..100; Shuffle(I,I)
Comments
Enable comment auto-refresher