finding specific distance on a plot
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I am trying to find the time it takes on the plot to go from its peak to 40 percent (or any other distance) of the way(downward). the y-axis is the data and x-axis is the time. the picture is just a sample and a random plot and it is not the real one because I have not got it yet. I know I should use findpeaks first to get the location and value of the peak but to find the minima, I only want the one which is after the peak not before as it is shown in the picture
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Ameer Hamza
2018-5-20
编辑：Ameer Hamza
2018-5-20
If x-axis values id t and y-axis values is y then you can find the required time using
[maxVal maxIndex] = max(y);
index = y < 0.4*maxVal;
fortyPercentIndex = find(index(maxIndex:end), 1);
Time = t(maxIndex+fortyPercentIndex-1) - t(maxIndex)
This approach the values of the signal occurring before the peak value and find the 40% point which occurs after the peak.
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2018-5-20
2018-5-20
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