how to use derivation to a function from the user

2017 11 28
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更新时间：2017 11 28
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I have been suggested to use anonymous function for functions from the user and it works, but now I need to do derivation of the entered function I try diff and it's not working
str = input('Please enter the function: ', 's');
f = str2func(['@(x) ',str]);
dydx=diff(f);
r1=dydx(2);
disp(r1);

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Stephen23
Stephen23 2017-11-28
"I need to do derivation of the entered function"
Do you need a symbolic result or a numeric result?
Manal
Manal 2017-11-28
both I need to display the derivative then the result of x that inputted by the user

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KSSV
KSSV 2017-11-28

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syms x
f = sin(x) ;
df=diff(f)

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Manal
Manal 2017-11-28
if I try this it will give me this error
Undefined function 'diff' for input arguments of type 'function_handle'

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Manal
Manal
2017-11-28

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Manal
Manal
2017-11-28

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