How to receive a function in MATLAB app DESIGNER given by user in edit field?

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Himalay Baidya
Himalay Baidya 2022-5-6
评论： Voss 2022-5-7
HI,
I am working on an app where user will put function and a value .output will be the value we get putting the input value in function.
such as, function will be
y=x^2+2^x+3
and x=2
how to code this??

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Voss
Voss 2022-5-6
Ran in:
Something like this would work for functions of one variable, which is always called 'x'
% user inputs:
str = 'x^2+2^x+3'; % function, taken from an EditField
x = 2; % x value
f = str2func(['@(x)' str])
f = function_handle with value:
@(x)x^2+2^x+3
y = f(x) % output
y = 11
To be more general than that, you'd have to modify this approach or do something else.
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Himalay Baidya
Himalay Baidya 2022-5-7
detailed code given below=-----function and a value is taken from user .and when button clicked the result shown in text field.
eq=app.EditField.Value;
x=app.EditField2.Value;
f = str2func(['@(x)' eq]);
y = f(x);
app.EditField3.Value=num2str(y);
Voss
Voss 2022-5-7
You're welcome! Glad it's working.
The code you shared just now looks like it will work, assuming:
  • app.EditField is an EditField (i.e., a uieditfield of style 'text')
  • app.EditField2 is a NumericEditField (i.e., of style 'numeric' - if not, you can use str2double to convert x to a number), and
  • app.EditField3 is an EditField (again, of style 'text' - if not, you can avoid converting y to a string with num2str and use the numeric value of y directly).

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