Check for incorrect argument data type or missing argument in call to function 'diff'.

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Andrew Ashley
Andrew Ashley 2021-5-27
回答： Mahesh Taparia 2021-6-3
>> f
f =
Inline function:
f(x) = ((x+2)^(2/3))(3*x^2 -2)^3)
>> diff(f,x)
Check for incorrect argument data type or missing argument in call to function 'diff'.
Find the derivative of the function: . This is the intended equation.
Have I input it correctly or am i missing something?

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回答（2 个）

Kunal Kandhari
Kunal Kandhari 2021-6-1
The correct piece of code will be:
f = inline('((x+2)^(2/3)*((3*x^2)-2)^3)','x')
ans = f(1)
matlab will internally convert it to:
f =
Inline function:
f(x) = ((x+2)^(2/3))*(3*x^2 -2)^3)
You can refer:
https://in.mathworks.com/help/matlab/ref/inline.html
Althrough inline will be removed in a future release. Use anonymous functions instead.
Mahesh Taparia
Mahesh Taparia 2021-6-3
Hi
It seems you are finding derivative of a function of x. If you don't have the value of x, then you can go by symbolic approach. For example, consider the code below:
syms x
y = ((x+2)^(2/3))*(3*x^2 -2)^3;
yDerivative = diff(y);
If you have the sample values of x, then use last 2 lines of code. For more information, you can have a look at the documentation of diff function here.
Hope it will help!

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