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Custom warning message does not show when called within a function

42 vues (au cours des 30 derniers jours)
Pascal Weller
Pascal Weller le 4 Nov 2020
Commenté : Mario Malic le 4 Nov 2020
I have got difficulties to get custom warning messages to pop up in MATLAB's console.
I start execution of the main script. At some point it calls a function that is coded in a seperate .m file. From this called function I would like to display a warning. It executes the line where the warning is called but nothing shows up in the console. How do I make this warning to show up? Thanks in advance for your help!
Dummy code:
Main script which is run:
fd = 'test.h5'
Script for function foo():
function foo(fd)
if exist(fd,'file')
warning('''%s'' already exists. Overwriting it.',fd);
Btw: When I put a fprintf() or disp() or error() instead of the warning() it will show up in the console.
  3 commentaires
Pascal Weller
Pascal Weller le 4 Nov 2020
Thanks for the quick response. Your prediction was accurate.
>> warning;
All warnings have the state 'off'.
For anyone facing the same issue: Here is how to enable all warnings:
Steven Lord
Steven Lord le 4 Nov 2020
To probe the warning state:
warning query

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Réponse acceptée

Luna le 4 Nov 2020
Modifié(e) : Luna le 4 Nov 2020
I agree with Walter, put that code on command window to get all warnings on:
warning all on;
Be sure that your if statement result is true. I recommend you to try this first:
function foo(fd)
if exist(fd,'file') == 2 % this is about exist function outputs. Check all the output states. if it is 2, that means file exists.
warning('''%s'' already exists. Overwriting it.',fd);
warning([fd, ' file does not exist.']);
Here is the link for exist function documentation:
  1 commentaire
Mario Malic
Mario Malic le 4 Nov 2020
It looks like that if expression is true when expression result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false.

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