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if i have a plot, how do i have find the derivative of the plot?

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Leah
Leah 2012-7-10
for example i have plot(x,y) how do i have find the derivative of it and then find the zeros in that derivative plot?

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John Petersen
John Petersen 2012-7-10
Do you have a preferred method of taking the derivative? There are many. A simple one (that does not work well for noisy data) is
dy = diff(y)./diff(x);
To find zeros, you could search for where dy changes sign.

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