Peak-finding function doesn't work.

function [M] = peak(A)
for j=2:size(A,2)
  if A(j,2)-A(j-1,2) >= 0 && A(j,2)-A(j+1,2) >= 0 
      M=[M,A(j,1)];
  end
end

This is supposed to be a function that makes a vector M that contains all local peaks from a vector A. It doesn't do anything. Could anyone tell me what is wrong?

Greetings and thanks in advance

Answer 1

[Matt Fig]

What do you mean by, "Doesn't do anything?" Do you mean you get an error? I would imagine that the error is something about an undefined variable M. If you are going to do it this way, you should define M before the loop.

M = [];

[Jan]

I did that the first time, added it again and now it works. Very strange...

[Matt Fig]

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