Finding the first, second and third maxima in a plot

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Ricky 2013-5-28

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Hello Everyone,

I want to extract the first the maximas in my graph and save the sequence in a seperate variable. I know the maximum function gives me the maximum value in a data set. But I am not able to use this information for finding the next peaks. I have uploaded the graph on the following link and I will mark the peaks which I want to extract from this.

http://tinypic.com/r/59u06q/5

Thanks

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Answer 1

Image Analyst 2013-5-28

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Try using findpeaks() in the Signal Processing Toolbox or imregionalmax() in the Image Processing Toolbox.

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Ricky 2013-5-28

编辑：Ricky 2013-5-28

I would like to thank you with this findpeaks() command.

While searching in the help I found this findpeaks command also. But now I am having another problem. My data is having 179 rows and 4010 columns. So I use a for loop and evaluate the peaks using findpeaks() function. My problem now is to store this new variable of size 179 rowsand unknown columns.

Image Analyst 2013-5-28

You can use a cell array to store variable-sized information, so row 1 could have 9 peaks, row 2 could have 5 peaks, and row 3 can have 11 peaks, etc. See the FAQ for a discussion of cell arrays: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

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