How to make nPr formula as the perms function makes nPn only ?

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How to make nPr formula as the perms function makes nPn only ?

Answers (1)

Ayden Clay
Ayden Clay on 2 Jun 2020
Hey Abdelrhman,
The nchoosek function ought to be what you're looking for.
It can provide the binomial coefficient for
b = nchoosek(n,k);
or every permutation for
C = nchoosek(v,k);
where v is a row or column vector (length < 15). For example, where v = [1,2,3,4]; and k = 2; we get:
C = nchoosek([1,2,3,4],2)
C =
1 2
1 3
1 4
2 3
2 4
3 4
and if you just want the number, you can ask for size(C,1).
sz1 = size(C,1)
sz1 =
6
Or you can do it in one move with:
sz1 = size(nchoosek([1,2,3,4],2),1)
sz1 =
6
I hope this helped!

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