The function "nchoosek" is not working in my code

Question

RDG 2013-4-13

I'm currently having a problem. Suppose I've a code as such:

%2 cell arrays named cnt with contents as follow:%

 cnt{1}=[3;1;3;2;1;2]
 cnt{2}=[2;3;1;3;1;2]

%Finds the index location for values not 1

for i=1:2
    ind=find(cnt{i}~=1)
end

%Performs nchoosek for the values corresponding to the indices

for i=1:2
    for j=1:size(cnt{i},1)
        value{i}=nchoosek(cnt{i}(ind(j)),2)
    end
end

The error returned is "??? Error using ==> nchoosek at 50 K must be an integer between 0 and N.

Error in ==> Workshop at 118 value{i}=nchoosek(cnt{i}(ind(j)),2)"

Is there a more direct way besides for loop? [Since it's not efficient and is not returning my desired result]

Answer 1

ChristianW 2013-4-13

cnt{1}=[3;1;3;2;1;2]
cnt{2}=[2;3;1;3;1;2]
value = cellfun(@(x) nchoosek(x(x~=1),2),cnt,'un',0);

or with loop

for i = 1:length(cnt)
    value{i} = nchoosek(cnt{i}(cnt{i}~=1),2);
end