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std for width of data,is exist function for that?

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x y
x y 2017-3-30
I wan to make step counter with 'findpeaks' function. Treshold for minimum height above one standard deviation are treated as a step I use 'minPeakHeight = std(magnitudeAccelerometer);'.
[pks, locs] = findpeaks(magNoG, 'MINPEAKHEIGHT', minPeakHeight)
How should I calculate teshold for minimum width in peaks , for paramater 'MinPeakDistance' to 'findpeaks' function. Is already exist this parameter(MinPeakDistance) in 'findpeaks' function. I need idea how to calculate...
My graph is look like this (I did 10 step). (I seted up the 'MinPeakDistance' to 50 manualy).

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