MATLAB Answers

Create an anonymous function after Symbolic differentiation

I want to differentiate a function f and the calculate the derivative of f at value of x. How can I do that? for example:

syms x
f=@(x) x^3+3*x+1;

Preferably I would like to create a function handle of the derivative and then calculate the derivative at x.


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2 Answers

Answer by Sean de Wolski
on 13 May 2013
 Accepted Answer

Almost there!

gfun = matlabFunction(g)


Rule #1 of Answers: if you rewrite something from MATLAB, you will make a typo :)

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Answer by Iman Ansari on 13 May 2013


syms x
f=@(x) x^3+3*x+1;
h=@(y) subs(g,y)


Thank you! But then if I ask for g(2) then I get this error:

Error using mupadmex
Error in MuPAD command: Index exceeds matrix dimensions.
Error in sym/subsref (line 1389)
        B = mupadmex('symobj::subsref',A.s,inds{:});

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