Keep track of iterator in different pushbuttons

Hello all,

Being part of a larger project, I wish to iterate over a bunch of pushbuttons on a Figure Window, and display the iterator number on the Command Window. I have written something like

for iter = 1 : 5
    uicontrol('style', 'pushbutton', 'position', [20 iter*30 50 20], 'string', 'Open...', 'callback', 'iter')
end

but this gives always

iter = 5

when invoking any of the five pushbuttons. What am I missing here?

Thanks for all the help! Gabriel

Answer 1

[Adam]

for iter = 1 : 5
    uicontrol('style', 'pushbutton', 'position', [20 iter*30 50 20], 'string', 'Open...', 'callback', @(src,evt) disp( iter ))
end

should work. I don't really know what I would expect of 'iter' as a callback, but I guess you demonstrated what it does!

Answer 2

[Jan]

The callback 'iter' is evaluated when the button is pressed. This is a string and it displays the value of the variable 'iter' in the base workspace. I assume, that you want something else. Without knowing any details of what you want I guess boldly:

fucntion yourGuiCreator
for iter = 1:5
  uicontrol('style', 'pushbutton', ...
            'position', [20 iter*30 50 20], 'string', 'Open...', ...
            'callback', {@myCallback, iter})
end

function myCallback(ObjectH, EventData, iter)
disp(iter)

Now iter is a variable and the current value inside the loop is stored statically in the callback's definition.

Note that I do not understand, what "iterating over buttons" mean. This loops create a set of buttons each time it is called.