Threading part of a function over each element in a cell array
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Hi,
I would like to thread part of a function over each element in a cell array. I'm afraid I'm being totally non-descriptive, so let me give an example.
Suppose I have a cell array, with each cell containing a 1 by 2 vector:
mycellarray={[1 2],[3 4],[5 6]};
I have a function, which I will call myfun. myfun takes three arguments:
myfun(a,b,c)
where a, b, and c are scalars. Let n be some scalar, say n=9. I wish to evaluate the function myfun with a=n and with b and c taking the values given in the 1 by 2 vectors contained in mycellarray. So, I would like the result to be:
{myfun(i,1,2),myfun(i,3,4),myfun(i,5,6)}
In other words, I want, in a sense, to "thread" myfun over mycellarray, which contains the values of b and c.
Is there a way to do this that might be faster, or more elegant in terms of the code, than the following (that is, using a "for" loop):
mycellarray={[1 2],[3 4],[5 6]};
n=9;
newarray=zeros(1,length(mycellarray));
for i=1:length(mycellarray)
newarray(i)=myfun(n,mycellarray{i}(1),mycellarray{i}(2));
end
Thank you very much for your time!
Andrew DeYoung
Carnegie Mellon University
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Sean de Wolski
2011-5-19
The for-loop is probably the fastest way. You could also do:
newarray = cellfun(@(C)myfun(n,C(1),C(2)),mycellarray)
But I've found cellfun to always be slower than a well constructed for-loop. It might be different on your machine/version.
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