Error using / Arguments must be numeric, char, or logical. what should I do I tried but did not seem to work?
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>> m=2+0
m =
2
>> n=2+5
n =
7
>> syms x
>> f=inline(2*x^2-(3*m-n)*x-m*n)/(x^2+(m-n)*x-n*m)
Error using /
Arguments must be numeric, char, or logical.
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Réponses (2)
Chandler Hall
le 13 Nov 2022
Modifié(e) : Chandler Hall
le 13 Nov 2022
To create a symbolic function, you must first declare it via the syms function, and then define its content. The syntax for this is straightforward but atypical:
m = 2; n = 7;
syms f(x)
f(x) = (2*x^2-(3*m-n)*x-m*n)/(x^2+(m-n)*x-n*m);
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Walter Roberson
le 13 Nov 2022
This is not correct. You can create a symbolic function in three different ways:
syms Name(Variable list)
Name(Variable list) = symbolic expression
Name = symfun(symbolic expression, Variable list)
The syms form has the side effect of defining the variables, but is not required before either of the other approaches.
Walter Roberson
le 13 Nov 2022
Never inline() a symbolic expression, it is not defined. matlabFunction() instead.
Never eval() a symbolic expression either, use subs()
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