How do you do numerical integration of a function in App Designer?

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Cayleigh Johnston
Cayleigh Johnston on 17 Aug 2019
Answered: Jyotsna Talluri on 20 Aug 2019
Is it possible to use the 'integral' function as in Matlab. I am struggling to write a function in terms of variable, say f(x), and then do integration on that function in AppDesigner.
My function is similar to x*0.25*(x/0.2)^0.1*exp(-(x/0.2)^0.1), and would like to integrate between two bounds that are user inputs within App Designer.
  1 Comment
Adam Danz
Adam Danz on 19 Aug 2019
Something in your app needs to trigger the function. It could be a button or a ValueChangedFcn. Once the function is invoked, from within the function you can extract all of the needed values from your GUI by using the app variable. You can write your function anywhere in your app and call it from the callback function.

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Answers (1)

Jyotsna Talluri
Jyotsna Talluri on 20 Aug 2019
Use the numeric edit boxes to input the limits of integration and to display the result of integration.Function for integration can be written in your app and can be invoked by calling it in pushbutton callback. You can extract the values from editboxes in pushbutton callback .
methods (Access = private)
function results = func(app,n1,n2)
syms x;
f=@(x)x*0.25.*((x/0.2).^0.1).*exp(-(x/0.2).^0.1);
app.result.Value=integral(f,n1,n2);
end
end
% val1,val2,result are editboxes
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: Button (callback)
function ButtonPushed(app, event)
n1=app.val1.Value;
n2=app.val2.Value; % editbox values
func(app,n1,n2);
end
end

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