The working of perms
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I tried perms('abc'). The doc says it is permutations in reverse lexicographic order. So I expected from the bottom - abc, acb, bac, bca so on. But the result I got was acb, abc, bac, bca ..... Can any one explain what is going on?
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Answers (2)
Thorsten
on 15 Oct 2015
Have a look at
perms(1:3)
The result you get with perms('abc') is analogous to this. To have lexicographic order, use
sortrows(perms('abc'))
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Jan
on 18 Oct 2015
Edited: Jan
on 18 Oct 2015
With Matlab R2011b I get:
perms('abc')
cba
cab
bca
bac
abc
acb
As reversed alphabetical order, I'd expect the last two lines to be swapped.
An efficient method to create the permutations in a sorted order: FEX: VChooseKO. But here the order is not "alphabetically" accoring to the contents of the input, but to the order of the values. So for an alphabetical order you'd need:
Str = 'acb';
VChooseKO(sort(Str), length(Str))
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