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Calculating numerically slope of a curve in a point

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Eirini Gk
Eirini Gk 2016-3-25
Hello. I want to find a way to calculate the slope in a curve (I want to write a function that works for every close curve like circle: x^2+y^2-1) in a point (x0,y0) without using 'sym' statement. I find diff and gradient statements but i'm new in matlab and i cant understand exactly how they work. I read that grad(F) give the gradient but F has to be a vector or matrix(?) . Please help. Thank you.

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