Finding where a slope becomes linear

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Daniel Jednorozec
Daniel Jednorozec 2012-3-15
I recently took a class teaching Matlab and I'm trying to use it at my internship to find where our plotted data, using a vector of x and y data values, starts to become linear. I am trying to use a polyfit and then find the slope using the maximum slope and find the y value of where that begins. Can someone help me?
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Jan
Jan 2012-3-15
What is a vector of x and y data? What exactly is a linear slope? Are you looking for a zero curvature? How do you use the maximum slope to find the value where what begins?

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Jan
Jan 2012-3-15
I'm not sure about the question. Perhaps you are looking for this:
curvature = diff(diff(x));
find(curvature < 1e-6)
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Daniel Jednorozec
Daniel Jednorozec 2012-3-16
Actually that did help me thank you. Sorry if I was so vague, the data was defined as two columns which I defined as x and y with respect to the axis they related to. But this answered my question.
Jan
Jan 2012-3-16
Fine. See also the GRADIENT command.

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