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Topic: nchoosek all pairwise combinations
Replies: 10   Last Post: Nov 27, 2012 7:46 AM

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Nasser Abbasi

Posts: 6,677
Registered: 2/7/05
Re: nchoosek all pairwise combinations
Posted: Nov 27, 2012 1:16 AM
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On 11/26/2012 10:12 PM, Jerry wrote:
> Hello,
> There is a vector
> A=['a', 'b', 'c', 'd','e']
> I would like to make a square matrix of all paiwise interactions of this vector:
> a b c d e
> a aa ba ca da ea
> b ab bb cb db eb
> c ac bc cc dc ec
> d ad bd cd dd ed
> e ae bd ce de ee
> However, nchoosek allow me to create only half of this matrix.
>Is there any function to make all these possible interactions within "A"?

Much easier to do this when your 'a','b', etc... are numerics, not
chars or strings.

What is the reason of using strings for this?

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