10.9 The try Statement

The original form of a try block looks like this:

try
  body
catch
  cleanup
end_try_catch

where body and cleanup are both optional and may contain any Octave expressions or commands. The statements in cleanup are only executed if an error occurs in body.

No warnings or error messages are printed while body is executing. If an error does occur during the execution of body, cleanup can use the functions lasterr or lasterror to access the text of the message that would have been printed, as well as its identifier. The alternative form,

try
  body
catch err
  cleanup
end_try_catch

will automatically store the output of lasterror in the structure err. See Errors and Warnings, for more information about the lasterr and lasterror functions.