Help using lastwarn.m

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mathworks2011
mathworks2011 on 4 Jan 2012
I have code which does:
[msgstr, msgid] = lastwarn;
warning('OFF', msgid);
dostuff(); %generates a waring message
warning('ON', msgid);
The problem with this is that I still get one waring message, as the last warn before dostuff() was called was a different message.
I dont want to turn all warnings off as this is slow.
I would have thought that I could hard code the warning I want to turn off, but this doesnt seem possible:
"Warning: Out of range or non-integer values truncated during conversion to character."
how can I use msgid to ensure I never see that warning when calling do stuff? (I dont want to fiddle with the GUI settings either).
thanks
  1 Comment
Walter Roberson
Walter Roberson on 4 Jan 2012
If you are getting that warning, your code is very likely wrong. You should figure out why it is happening, and change your code to prevent those circumstances from arising. That might involve using a different data type, or using a cell array, or might involve using floor() or ceil() or fix() or round() so that it is only integral values that are submitted to char()

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Accepted Answer

mathworks2011
mathworks2011 on 4 Jan 2012
>> [msgstr, msgid] = lastwarn;
>> msgstr
msgstr =
Out of range or non-integer values truncated during conversion to character.
>> msgid
msgid =
MATLAB:nonIntegerTruncatedInConversionToChar
so I have msgid. What are you suggesting I do with it?
something like:
warning('OFF), 'MATLAB:nonIntegerTruncatedInConversionToChar'); ?
thanks
  1 Comment
Honglei Chen
Honglei Chen on 4 Jan 2012
Yes, warnging('off','MATLAB:nonIntegerTruncatedInConversionToChar'); I've also updated the answer above.

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More Answers (1)

Honglei Chen
Honglei Chen on 4 Jan 2012
You need to find out the corresponding id generated by dostuff. You can try to do this by first reset the warning state and then run dostuff and lastwarn
warning('');
dostuff();
[msgstr, msgid] = lastwarn;
warning('off',msgid);

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