How to store variables in Matlab GUI

Hi,

I am having trouble to store variables in Matlab GUI. I really couldn't grasp the concept of handles without an example.

So below is my GUI. What I'm trying to do is to (1) load my data based on the criteria from the two textboxes, (2) perform analyses and (3) plot the result by clicking the plot button. But for the sake of this question, let's simplify the problem into: (1) load Stock ID and Year by clicking Load Button and (2) plot the two points.

Now, how do I use guidata() to store variables yearid and sid so that I can call them on another function? Thanks a lot. Aditya

    methods (Access = private)

        % Button pushed function: LoadDataButton
        function LoadDataButtonPushed(app, event)
            
            % get the year ID from the YearEditField
            yearid = app.YearEditField.Value;
            
            % get the stock ID from the YearEditField
            sid = app.StockIDEditField.Value;
           
        end
        
        % Button pushed function: DisplayPlotButton
        function DisplayPlotButtonPushed(app, event)
        
            plot(yearid, sid) % <--------- Problem???
            
        end

    end

Answer 1

[Oriol Brasco]

First add yearid and sid to the properties (Code Browser --> Properties), then these propierties form part of the app struct.

Once the properties are created, save the value you want to save when you push the loadData:

app.yearid = app.YearEditField.Value;
app.sid = app.StockIDEditField.Value;
    

In order to get the value just enter the struct like:

 function DisplayPlotButtonPushed(app, event) 
     plot(app.yearid, app.sid)  
 end
 

You could also:

 function DisplayPlotButtonPushed(app, event) 
     plot(app.YearEditField.Value, app.StockIDEditField.Value)  
 end
 

[Aditya Tan]

Hi Oriol,

Thanks for your answer.

But the following plotting code:

plot(app.UIAxes, app.yearid, app.sid, 'o', 'Markersize', 3);

Produces an error:

Error using plot

Not enough input arguments.

The following code, however,

plot(app.UIAxes, 10, 20, 'o', 'Markersize', 3);

works. May you help me again, please? Thanks. Aditya

[Oriol Brasco]

app.YearEditField.Value 

Is a char so try to convert it to double before plotting:

app.yearid=str2double(app.YearEditField.Value)