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error when calculate differentiation of circle function

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Yu Li
Yu Li 2021-6-10
关闭： Yu Li 2021-6-10
Hi:
I have a circle function: (x-x0)^2+(y-y0)^2=r^2;
in order to calculate th tangent of this function, I organized the function to y=sqrt(r^2-(x-x0)^2)+y0, and tried to calculate it in Matlab using "diff" function, however, Matlab reported error, below is the code, could anyone help me with this?
funcCircle = @(x)(sqrt(r^2-(x-x0)^2)+y0);
funcCircle_deri=diff(funcCircle,x);
Thanks!
Yu

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