MATLAB Programming

8 Error Handling
matrixMultiply(A, C)
** Both arguments must be double matrices
Regenerating an Error
Use the rethrow function to regenerate an error that has previously been
thrown.Youmightwanttodothisfromthecatch part of a try-catch block,
for example, after performing some required cleanup tasks following an error.
This is the general method used to rethrow an error in a try-catch block:
try
- do_something -
catch
- do_cleanup -
rethrow(lasterror)
end
rethrow generates an error based on the MATLAB structure you provide
as an input argument. The input structure must have at least one of the
message, identifier, andstack fields.
Field Name
message
identifier
stack
Description
Character array containing the text of the error
message.
Character array containing the message identifier of
the error message. If the last error issued by MATLAB
had no message identifier, then the identifier field
is an empty character array.
Structure providing information on the location of
the error. The structure has fields file, name, and
line, and is the same as the structure returned by
the dbstack function. If lasterror returns no stack
information, stack is a 0-by-1 structure having the
same three fields.
If you simply want to regenerate the last error that occurred, the lasterror
function returns a structure that can then be passed directly to rethrow.
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