Import mat file in to App Designer

I would like import mat-file that contains some variables, but I can't load the file. Thanks for all.

    % code
  classdef app1_1 < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure              matlab.ui.Figure
        TabGroup              matlab.ui.container.TabGroup
        Evporazione_annuale   matlab.ui.container.Tab
        UIAxes                matlab.ui.control.UIAxes
        Evaporazione_mensile  matlab.ui.container.Tab
        UIAxes2               matlab.ui.control.UIAxes
        ANNILabel             matlab.ui.control.Label
        Lista_anni            matlab.ui.control.DropDown
    end

    properties (Access = private)
       load 'C:\Users\cecch\Documents\UNIVERSITA\Impianti Speciali Idraulici\Dati Portata\workspace_evaporazione.mat'
    end

[dario cecchetti]

all very clear! thank you

Answer 1

[lokender Rawat]

You can create a sample mat file named 'example.mat' with just four variables (a=1,b=2,c=3,d=[10 11 12 13]). Go to the 'Code View' and then add 'public property' like below to load the matlab file in your app. This 'var' variable is accessible to all other functions using 'app.var' and you can provide the variable name after that you want to access:

properties (Access = public)
        var=load('\path_to_location\example.mat'); % specify the path to mat file
end

methods (Access = public)

function results = fun1(app)
    results=app.var.d;
end

For results to appear, you can create a 'button' and 'text area' in the design view. Right click the 'button' and then select 'Go to ButtonPushed callback' and then on add the following code in the function callback:

app.TextArea.Value=num2str(fun1(app));

Once you run the app and click the button, you get the desired variable 'd' values in the 'text area'. I hope the above helps. You can refer the following documentation link and go over different sections of 'AppDesigner':

https://in.mathworks.com/help/matlab/code-app-behavior-in-app-designer.html

[dario cecchetti]

all very clear! thank you

[Krystian Nowakowski]

Hi, thank you for the reply. I have another complication. I would like to pass to the app the path to the data file on the app startup. I don't know how to do it, because if I try to load in the startup function, then the variables are not accesible outside the startup function and there is no way to pass it to the section of the code that creates properties. Can you think of a solution to such a problem?

Answer 2

[Kunpeng Zhang]

How can I select a specific variable in the .mat file which contains different variables in the user interface? By 'text area' or what

[Asim Zaib]

example_matFile.mat.Variable_you_want_to_select