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How to apply a function to an indexed array without loop

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Laura Luidolt
Laura Luidolt 2018-1-4
回答： Chris Perkins 2018-1-8
Is there a way to do the following
A = rand(100,2);
c = randi(5,[100,1]);
for i = 1:5
B(i, :) = mean(A(c == i, :));
end
without a loop?
A is my input data, c is some sort of classification and mean could be any function. I tried
A(c == 1:5, :)
but this just gives me an error.

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回答（1 个）

Chris Perkins
Chris Perkins 2018-1-8
Hi Laura,
You might be able to re-structure your problem a bit and use "arrayfun", which applies a function to each value in the given array. See the following documentation link for more information:
https://www.mathworks.com/help/matlab/ref/arrayfun.html

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