how to determine start point?

2013 9 3
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hi, I have an array of data which gives me a noisy graph that looks like a pulse. I want to determine the start point of the top part of the pulse. I also have several of those arrays and they are not similar to each other at all. I tried taking the top 5% of data, but this doesn't suit all arrays. I also tried using diff, but there is too much noise. can someone help me? thx

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Youssef Khmou
Youssef Khmou 2013-9-3
Ronen, you mean peak detection in 1D signal?
Ronen
Ronen 2013-9-3
the start point of upper graph is not the peak of it. I can't use max function or some peak finder function.
Youssef Khmou
Youssef Khmou 2013-9-3
what type of noise those array contain? try to pass them by low pass filter, use median filter, or use fir1 with chosen cutoff frequency, then take the 5% top .
Ronen
Ronen 2013-9-3
编辑：Ronen 2013-9-3
it's not exactly noise, just data. I've opened an excel file and used the data (1D array) to creat the graph. filter will corrupt the data. in any case I don't think I can use the the top 5% because the data is varing too much
Ronen
Ronen 2013-9-3
ok, I've uploaded it... how do I display it here?
dpb
dpb 2013-9-3
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Ronen
Ronen
2013-9-3

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