App Designer input arguments

Hi,

I am using the App Designer for the first time (MatLab 2019a) and I am strugging with a basic problem - I am using a script where I create some variables and call the app. I want to use the variable from the workspace inside the app. I tried to use it as an app Input Argument but in many ways, it does not work. My code is below (the app). The error message I am getting is 'Cannot run with provided input arguments. Caused by: Not enough input arguments.' Can someone tell me what I am doing wrong?

classdef Experiment_app1 < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure               matlab.ui.Figure
        PLAYButton             matlab.ui.control.Button
        HvorhjtEditFieldLabel  matlab.ui.control.Label
        HvorhjtEditField       matlab.ui.control.NumericEditField
        Image                  matlab.ui.control.Image
        Loudnessscalingexperimentnoise1Label  matlab.ui.control.Label
        NextButton             matlab.ui.control.Button
    end

    
    properties (Access = private)
        data 
    end


    % Callbacks that handle component events
    methods (Access = private)

        % Code that executes after component creation
        function startupFcn(app, noise1)
          Experiment_app1.data = load('CI_loudness_experiment_2.mat', noise1)
        end

        % Button pushed function: PLAYButton
        function PLAYButtonPushed(app, event)
            sound(noise1(:,1),Fs)
        end
                  

[Adam]

How are you calling the app?

Also

% Code that executes after component creation
function startupFcn(app, noise1)
   Experiment_app1.data = load('CI_loudness_experiment_2.mat', noise1)
end

will create a struct, assign your loaded data to a field of that struct, then throw it away. I assume you want to call

app.data = load( ... )

instead, to actually load it into the app.

[Katarzyna Dragun]

I changed it to app.data = load(...) as you suggested (this is what I already tried it before actually...).

In my main script I am just calling the name of the app:

Experiment_app1
uiwait(gcf); 

[Adam]

But the whole point of this was to have input arguments wasn't it? Yet you are calling it without passing in that input argument! Pass in whatever 'noise1' should be.

Answer 1

[Harsha Priya Daggubati]

Hi, 

I assume that your mat file ‘CI_loudness_eperiment_2’ contains a variable named ‘noise1’. The approach you are following seems correct as per my knowledge. I suggest debug through the code with breakpoints and make sure whether the data loads as intended. If the problem persists, I ask to properly attach the error messages you are getting.