How to find a combination like this
1 view (last 30 days)
Show older comments
Nooh Hood Mohamed Almahfoodhi
on 24 Feb 2019
Commented: Walter Roberson
on 1 Mar 2019
I am wondering is there a way where I could use a matrix in combinatorics such as
nchoosek(4,1:4) where it calcluates 4choose1, 4choose2,... 4choose4 ?
Is thie possible in Matlab?
0 Comments
Accepted Answer
Walter Roberson
on 24 Feb 2019
N = 4;
temp = factorial(0:N);
temp(end) ./ (temp .* fliplr(temp))
This would be 4C0, 4C1, 4C2, 4C3, 4C4, so you could index into the result to get the subset you need.
2 Comments
More Answers (1)
Jos (10584)
on 1 Mar 2019
Computationally less efficient, and mathematically less beautiful as Walters' snippet, but more matlab-ish in style:
N = 4 ;
C = arrayfun(@(k) nchoosek(N, k), 0:N)
or after same mathematical adjustments to N! / K!(N-K)!
C2 = arrayfun(@(k) prod(k+1:N)/prod(2:N-k), 0:N)
0 Comments
See Also
Categories
Find more on Elementary Math in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!