finding the first, second and third maxima in the signal

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Ricky
Ricky 2013-5-29
Can someone please help me with the code for finding the signal peaks in the below figure .
I hae tried using for loops, and also MATLAB function findpeaks() . I am new to MATLAB and I am not sure if I am doing this correctly. Please help me.
http://tinypic.com/r/59u06q/5
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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
And how can we do it by code? You should explain why some peaks are ignored, If there is no explanation it's impossible to do it by program.
Ricky
Ricky 2013-5-29
These are like echos of a signal and I want only the first signal and the next 3 echos of the signal.

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
I suggest that you do it manually using the function ginput
  2 个评论
Ricky
Ricky 2013-5-29
Hello Azzi, I do not want to do this manually. Somehow I need to write a code which says that if my peak value is greater than previous 3 values and next 3 values it is a good Data point. Also as soon as i get 4 values in this variable I should stop the execution.
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
[peaks,index]=findpeaks(y)
for k=1:numel(peaks)
ii=index(k);
jj=0;
if abs(y(ii)/y(ii-1))>=3 & abs(y(ii)/y(ii+1))>=3
jj=jj+1
real_peak(jj)=peaks(k)
index_peak(jj)=ii
end
end

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