How to input equations in MATLAB and operate it?
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Raihan Khalil
le 1 Jan 2016
Commenté : Walter Roberson
le 23 Juin 2022
I'm using MATLAB R2013a. I want to input an equation in Matlab like f(x) = x^2 - 2*x + 3. And I want it to be inputted by the user. I use inline() function for this. eg.
func = input('Enter a function: ','s');
f = inline(func);
And I have able to do some works with it. But I want to differentiate this equation. I was trying to use diff() function for this. But it doesn't work. When I use diff(f,x); it shows error. How can I solve my problem?
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Walter Roberson
le 1 Jan 2016
You should not use inline(). inline() has been recommended against since MATLAB 5.1, over a decade ago. inline() was replaced with anonymous functions, which can be built using str2func()
You cannot differentiate inline functions or anonymous functions. You can parse the string, and develop a set of routines to differentiate whatever set of input functions you allow. Or you can use the Symbolic Toolbox. For example,
f = sym('x^2 - 2*x + 3')
diff(f,x)
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Jonathan Moussa NDAO
le 17 Mai 2021
You can try using the matlab builtin func str2func that convert your input in a matlab function handler like syntax('')
func = str2func(input("Enter the function, e.g @(x)2*x - 3: ", "s"));
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