push button to change a variable

I guesss this is a very simple question, but I am spending more time searching for the answer, so I better ask here instead.

I made 3 pushbuttons, when I click on of them, a variable has to be changed, so like:

[Button1] when pressed: bp = sys
[Button2] when pressed: bp = mean
[Button3] when pressed: bp = dia

Thanks in advance

kiessys = uicontrol( 'Position', [10 35 60 30],'String','Sys(R)','Callback','????' );
kiesmean = uicontrol( 'Position', [10 70 60 30],'String','Mean(B)','Callback','????' );
kiesdia = uicontrol( 'Position', [10 105 60 30],'String','Dia(G)','Callback','????' );

This is what I have btw, what callback should I use, if any?

Answer 1

Hi Sven (nice name, btw), here's what I think you're looking for.

Try making a myFunction.m file with the contents below, then run it. Note that I assign bp in the parent function, outside any of the callback functions that the buttons activate. Because of this, these callback functions "share" bp and can change it and access it accordingly.

function myFunction()

bp = 'initial value'; % Assigned *outside* the callback functions so it is "shared" to them
figure
uicontrol( 'Position', [10 35 60 30],'String','Sys(R)','Callback',@(src,evnt)buttonCallback('sys') ); 
uicontrol( 'Position', [10 70 60 30],'String','Mean(B)','Callback',@(src,evnt)buttonCallback('mean')  ); 
uicontrol( 'Position', [10 105 60 30],'String','Dia(G)','Callback',@(src,evnt)buttonCallback('dia') );
uicontrol( 'Position', [100 105 60 30],'String','Print Value','Callback',@(src,evnt)printMyVar );

      function buttonCallback(newString)
          bp = newString;
      end
      function printMyVar()
          disp(bp)
      end
  end

Thanks Sven, nice name indeed :D

I got a quick answer on stackoverflow which did what I needed. It seems like the code is very similar to yours, thanks anyway!

global bp;

figure
kiessys = uicontrol( 'Position', [10 35 60 30],'String','Sys(R)','Callback', {@fun, 'sys'});
kiesmean = uicontrol( 'Position', [10 70 60 30],'String','Mean(B)','Callback', {@fun, 'mean'});
kiesdia = uicontrol( 'Position', [10 105 60 30],'String','Dia(G)','Callback', {@fun, 'dia'});
kiesdia = uicontrol( 'Position', [10 140 200 30],'String','Output current value','Callback', 'disp(bp)');

and store the callback-function fun to fun.m:

function fun(~, ~, value)
global bp;
bp = value;
end

Answer 2

    sorry i didnt see your comment

In this code kiessys = uicontrol( 'Position', [10 35 60 30],'String','Sys®','Callback','????' );

you are not setting the style property..

you can try this

h1=uicontrol('Style','text','position',[a b c d],'tag','text1','String','Sven'); 

push buttons may be created like this

h2= uicontrol('Style','pushbutton','String','Sys(R)','callback','pb1_callback','position',[a b c d]);

in the call back function 'pb1_callbck' add this code

set(findobj('tag','text1'),'String','bp=mean');       

similarly you can create other push buttons and write the call back functions.

uicontrol handles also can be used for changing properties. matlab help contains many example programs

Does this change the text on the button? Because that is not what I need...

I have 3 signals, and the user has to choose one of the three, by clicking the corresponding button.

By clicking the button, the variable 'bp' should be set to either 'sys', 'dia', or 'mean', depending on the button that is pressed