How to find tangent of a curve and find the distance from the centre?

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Rahul Seth
Rahul Seth am 5 Jul. 2021
Kommentiert: Rahul Seth am 9 Jul. 2021
I have plotted a curve from a jpg image using the ginput feature of matlab. It comes out to be a curve. I want to find the various radius of the curve at different points.I thought of finding the tangent at different point. But i dont know the curve equation, how to achieve this?

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Amit Bhowmick
Amit Bhowmick am 5 Jul. 2021
If you have xdata ydata get the equation of the curve using cfit tools.

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