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# Trouble taking the differential of a function

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Raymond Elliott on 23 Feb 2021
Answered: Star Strider on 23 Feb 2021
I have the following code:
func =@(x) (((w_0*L)/(3*(pi^4)*E*I))*48*(L^3)*cos((pi*x)/(2*L))-48*(L^3)+(3*(pi^3)*L*(x^2))-((pi^3)*(x^3)));
dfunc = diff(func);
However, whenever I try to fun the code I get the following error, "Check for missing argument or incorrect argument data type in call to function 'diff'." What am I missing here?
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### Answers (1)

Star Strider on 23 Feb 2021
What am I missing here?
Most likely, using the Symbolic Math Toolbox.
Try this:
syms E I L w_0 x
func(x) = (((w_0*L)/(3*(pi^4)*E*I))*48*(L^3)*cos((pi*x)/(2*L))-48*(L^3)+(3*(pi^3)*L*(x^2))-((pi^3)*(x^3)));
dfunc = matlabFunction(simplify(diff(func,x), 500));
Note that ‘dfunc’ is now an anonymous function that can be used in numeric calculations outside of the Symbolic Math Toolbox.
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