GUI - using "handles.tag" with variable tag

Hi everybody,

I used GUIDE to built a GUI with several axes taged as data1,data2,data3,... In the opening function I use

set(handles.tagsofallaxes,'visible','off');

to display them all.

Now I inserted checkboxes which get a unique plot and place this plot in the next free axes. For example: first plot in data1, second in data2, maybe I uncheck afterwards the checkbox for plot1 and data1 will be free again. when I check for plot 3 after this, it should appear in data1 which was empty at this moment.

For this I coded a function that gives me the next free axes. Output of the function is a string (data1,data2,data3,...).

I don't get how I can use the output to show my plot on the axes.

        nextfreeaxes = counter('position'); % saves tag of next free axes in string
        axes(handles.nextfreeaxes)

gives error: Reference to non-existent field 'nextfreeaxes'.

When I build a switch case everything is fine. But its not the way I want to do this.

        nextfreeaxes = counter('position'); % saves tag of next free axes in string

           switch nextfreeaxes
               case 'data1'
                   axes(handles.data1) 
               case 'data2'
                   axes(handles.data2)
               case 'data3' 
                   axes(handles.data3)
               case 'data4'
                  axes(handles.data4)
          end

I know that handles is a struct, but I don't get how to have access to its parts in the way I need it. I am a beginner in coding so please help me.

Answer 1

[Walter Roberson]

handles.(nextfreeaxes)

However, I suggest that you just create a vector of all of the values,

axhandles = [handles.data1, handles.data2, handles.data3];

Then you can index them

axes(axhandles(idx))