do specific work after a specific warning

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civil tech
civil tech on 4 Jul 2022
Commented: civil tech on 5 Jul 2022
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?

Answers (2)

Walter Roberson
Walter Roberson on 4 Jul 2022
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.

Image Analyst
Image Analyst on 4 Jul 2022
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

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