do specific work after a specific warning

Hello everyone.

I want to write a command with the following task:

if a specific warning is happend, do a specific work.

For example:

class 0 = [1, 2, 2, 1, 4, 5, 4, 4,];
warning('off');
class = kmeans(X,10);
if (Warning: Failed to converge in 100 iterations during replicate 10)
    class = class0;
end

How to write the "if-condition" above in the command line?

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/lastwarn.html

Use lastwarn, especially the two-output version that lets you get the message id.

Trick of the trade, though: immediately before the command to be tracked, use

warning('')

otherwise lastwarn might refer to a warning from before the kmeans call.

[civil tech]

Thank you.

Answer 2

[Image Analyst]

Maybe try this:

% Clear the last warning.
lastwarn('Success');
class = kmeans(X,10);
% See if there was a warning.
[warningMessageString, warningMessageID] = lastwarn;
if contains(warningMessageString, 'Failed to converge')
    % Alert user
    uiwait(warndlg(warningMessageString));
    % Do anything else you want to do, like exit or whatever.
end

[civil tech]

Thank you.