MATLAB Programming

Message Identifiers
case 'myfileio:noaccess'
error('DisplayImg:noaccess', ...
['Can''t open file "%s" for reading\n', ...
'You may not have read permission.'], filename);
case 'myfileio:invformat'
error('DisplayImg:invformat', ...
'Unable to determine the file format.');
end
end
If the last error has no message identifier tag associated with it, then
MATLAB returns an empty string in the identifier field:
error('This error has no message identifier.');
??? This error has no message identifier.
err = lasterror;
err.identifier
ans =
''
Inputs to lasterror
In addition to returning information about the last error, lasterror also
accepts inputs that modify the MATLAB copy of the last error. Use the
command format shown below to change the error message string and
message identifier returned by subsequent invocations of lasterror.
err.message = 'new_errmsg';
err.identifier = 'comp:new_msgid';
last = lasterror(err)
last =
message: 'new_errmsg'
identifier: 'comp:new_msgid'
stack: [0x1 struct]
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