uicontrol callback 'disp

Hello, when I input the following line of code into the Matlab command window: h = uicontrol('style', 'pushbutton', 'string', 'Hello', 'position', [20 150 100 70],'callback', 'disp("Hello World")');

it seems to work because a user interface comes up with no initial error with a button that has the words Hello World on it. But then when I press the button I get the following error:

??? Error using ==> disp("Hello World") Error: The input character is not valid in MATLAB statements or expressions.

??? Error while evaluating uicontrol Callback

What could I be doing wrong? I got the simple callback example from a Matla basic GUI Programming manual.

Thanks for any suggestions.

Answer 1

[Paulo Silva]

h = uicontrol('style', 'pushbutton', 'string', 'Hello', 'position',...
    [20 150 100 70],'callback', 'disp(''Hello World'')');

[Oleg Komarov]

@melissa: the difference is in the single apostrophe repeated twice.

[melissa]

Thank you Paulo and Oleg so much. I would have never caught that! I knew it had to be something simple but I've never heard of a single appostrophe being used twice to display text instead of quotation marks, so I didn't even think about that.