MATLAB: Is it possible to check warning message

checkfunctionmessagewarning

I would like to check if a function display a warning or not? Is it possible?

Best Answer

Try using lastwarn:

% Initialize the global lastwarn variable to "Success"
lastwarn('Success') 
% Some code that may or may not produce an error
a=10;
% Check if a warning was issued.
if strcmp(lastwarn, 'Success')
  % All is well - no warning.
  fprintf('All is well - no warning.\n');
else
  % A warning was issued.
  fprintf('A warning was issued..\n');
end

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MATLAB: Matlab Error Message

Your x must have strictly more or less than 100 rows. Hence the assignment fails.

Note that a much simpler way of achieving what you want is with bsxfun:

x = bsxfun(@times, Cr, x2)  %that's all that's needed. No loop.

MATLAB: How to obtain a warning message

As you found out already, lastwarn contains the last message only. You could overload the function warning to create a history of messages:

function varargout = warning(varargin)
persistent MsgList
if isa(MsgList, 'double')
  MsgList = {};
end
if nargin == 2 && isempty(varargin{1}) && isa(varargin{1}, 'double')
switch varargin{2}
  case 'GetList'
    varargout{1} = MsgList;
    return;
  case 'ResetList'
    MsgList = {};
    return;
end  % No OTHERWISE!
varargout = cell(1, nargout);
[varargout{:}] = builtin('warning', varargin{:});
MsgList{length(MsgList) + 1} = lastwarn;

This adds new messages for commands like warning('off', 'backtrace') also, so much more details are required for a smart behavior. But this demonstrates the general idea.

[EDITED] I've replaced the method to obtain and clear the list of messages. Using a magic string method in the first input is not 100% clean. Now this is used for controlling:

warning([], 'GetList')
warning([], 'ClearList')

Although it is very unlikely that somebody uses the warning message '$GetList', it might be a trap

Best Answer

Related Solutions

MATLAB: Matlab Error Message

MATLAB: How to obtain a warning message

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