how to break the data? and get them into new variable.

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Chenchen on 31 Jan 2014

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Answered: Image Analyst on 31 Jan 2014

I have all the data, which has the blue plot in the pic. And I want to brake it to several parts. I want to get the peak value of these four highlighted and I want to get these 4 descending array of data, means I want to get each set of data that start from peak and end to zero. And I will define them to a new vector.

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Azzi Abdelmalek on 31 Jan 2014

There are more then 4 peaks

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Answer 1

Image Analyst on 31 Jan 2014

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Threshold the signal at 300.

above300 = signal > 300;

Then use diff to find the location of all the starting peaks.

starts = find(diff(above300) == 1);

Then use a for loop on each peak to "climb" the peak. Then use a for loop and if you can "fall" down the peak all the way to zero without hitting an element that climbs again, then take that section. I assume you know how to do for loops and don't need me to do it for you.