I can not use i j k as a sym type what should I do

Error using syms (line 284)

Unable to create a symbolic variable 'i' by using 'syms' inside a MATLAB function because 'i' is an existing function name, class name, method name, and

so on. Use 'sym' instead.

I keep getting this error when I am trying to get this (x^2)*i+(y*j) equation from App designer.Firstly I get this equation as a string type and convert it to the sym to do sum mathematical calculations.

It works outside of the Appdesigner but when I try to write this to the appdesigner edit text, I got this error

How can I solve this ?

Answer 1

[Askic V]

This is how I would solve this problem:

c1 = test()

v1 = 

c1 = 

c1 = 

function c1 = test()
    syms x y z k real
    i = sym('i');
    j = sym('j');
    v1 = sym(dot([x^2 y z],[i j k]));
    c1 = subs(v1,{x y z},{2 -3 2});
end

As you can see, i and j can be defined as symbolic variables inside the function. You just neen to use sym function.