Threading part of a function over each element in a cell array

Question

Andrew 2011-5-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/7814-threading-part-of-a-function-over-each-element-in-a-cell-array

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