how to determine start point?

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Ronen
Ronen 2013-9-3
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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Ronen
Ronen 2013-9-3
ok, I've uploaded it... how do I display it here?

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