Question: How can I plot the derivative of a function?(adsbygoogle = window.adsbygoogle || []).push({});

Following code for problem 5.9 in MatLab by Gilat 4th Ed:

t=[0:1:20];

theta=pi*(1-exp(-0.2*t));

r=20+30*(1-exp(-0.1*t));

v=diff(theta)

table=[t' theta' r']

polar(theta,r)

polar(theta,v)

Error message:

??? Error using ==> polar at 61

THETA and RHO must be the same size.

Error in ==> Prob5_16 at 12

polar(theta,v)

I have looked around for what may be the larger issue and it seems that when you use the "diff" function it shortens one dimension of the array (https://www.physicsforums.com/showthread.php?t=55524)

Any help please? The link provides "an answer" but i don't understand what he means.

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# Matlab Second Derivative Ploting Problem

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