how to insert an equation in a edit fill

Question

jose ramire 2019-3-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449088-how-to-insert-an-equation-in-a-edit-fill

回答： Walter Roberson 2019-3-9

i'm using app designerand i need that the user introduce a equation. with the variable 'x' like 2*x+1

i using this but doesn't take the equation

j=app.t.Value;

g=@(x) j;

app.c.Value=g(2);

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Answer 1

Cris LaPierre 2019-3-9

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https://ww2.mathworks.cn/matlabcentral/answers/449088-how-to-insert-an-equation-in-a-edit-fill#answer_364617

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What do you mean by 'doesn't take the equation'? What is the expected behavior? How have you created this in app designer?

If I have to edit fields (numeric) in my app, if I set up the callback for edit field t this way, it works.

% Value changed function: t
function tValueChanged(app, event)
    j = app.t.Value;
    g=@(x) j;            
    app.c.Value=g(2);
end

The way you've written you anonymous function, it will always return the value of j no matter what value you use when calling g. So if j=5, app.c.Value is 5 despite assigning it g(2). If you want it to use the value you are passing in, update your anonymous function to use the variable you specified with '@'

g=@(x) x;