On MATLab app designer, how can i get an editfield text as a variable?
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Hello, I have am developing a matlab app, where the app user inputs a function to an edit field, and i need to use whatever that function is in a later part of the code. The problem is that the editfield outputs as text rather than a variable/function. Does anyone know how can I output it as a variable?
The code is as follows:
So say user inputs to EditField: x(1)^3 + x(2)^2
Then I want to set: val = app.EditField.Value;
However, this gives me the text: val = 'x(1)^3 + x(2)^2'
When i want: val = x(1)^3 + x(2)^2
Is this possible? Thanks for the help.
2 Comments
Fangjun Jiang
on 9 Jul 2020
Do you mean you have x defined,e.g. x=1:3, you want to Val=1^3+2^2=5?
or do you want val=f(x)=x(1)^3 + x(2)^2 as a function handle?
Answers (2)
Fangjun Jiang
on 9 Jul 2020
EditFieldText='x(1)^3 + x(2)^2';
F=str2func(['@(x)',EditFieldText]);
Then pass the function handle F to another function and use it. You don't have to worry about variable name x.
>> y=1:3
y =
1 2 3
>> F(y)
ans =
5
or you can pass EditFieldText over to the other function and construct the function handle there
0 Comments
Arthur Roué
on 9 Jul 2020
2 Comments
Dennis
on 9 Jul 2020
It might be worth to mention that this might cause problems down the road depending on your apps users. eval will evaluate any expression entered - including for example system commands.
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