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Min and local max of a curve

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chess
chess 2014-8-10
编辑： chess 2014-8-10
Hi I have a histogram which I want to find its min and max. So lets say the first max happens around 0.1 the local mean is at around 0.3 and second local max is at around 0.8.
I use findpeaks command but my first question is how to find a location on horizontal axis after having the index of maxima or minima? (specially for the minima and second max)?
2-How to find location of minimum because findpeaks only gives maximum location?

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Image Analyst
Image Analyst 2014-8-10
编辑：Image Analyst 2014-8-10
The usual method is to use findpeaks on the inverted signal, so that what were once valleys (minima) now become peaks.
flippedSignal = max(signal) - signal;
By the way, what does this have to do with image processing?
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chess
chess 2014-8-10
编辑：chess 2014-8-10
I got this curve from histogram of an image then I smooth it.

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