>>>>> "Ted" == Ted Harding <[EMAIL PROTECTED]>
>>>>> on Sun, 12 Oct 2003 13:44:27 +0100 (BST) writes:
<.....>
Ted> I've now installed R-1.8.0 which does include
Ted> 'tryCatch' and related things, but from the look of it
Ted> I'll have to study it a bit before I see how it all
Ted> works!
Ted> Meanwhile, thanks to others (Spencer Graves, Achim
Ted> Zeileis, as well as Thomas Lumley and Andy Liaw) for
Ted> suggestions. Though I'd already looked at "try", I
Ted> thought I'd have another go. It turns out I'd been
Ted> muddled about testing the result of 'try' in the right
Ted> way.
Ted> In fact, if 'myfun(...)' might fail in a loop, then
Ted> result <- try(myfun(...));
Ted> if(class(result)=="try-error") next ;
Ted> will have the effect of breaking out of the current
Ted> cycle of the loop and starting a new cycle. Otherwise
Ted> 'result' will be a valid returned value from
Ted> 'myfun'. This is exactly what I had wanted.
very good.
slightly more recommendable code is
result <- try(myfun(...))
if(inherits(result, "try-error")) next
- using inherits(obj, cls) is more robust than
class(obj) == cls because it also works when `obj' has more
than one class (e.g. a `glm' object) or when `obj' has no
class {i.e. when `methods' is not attached or in older R versions}.
- no trailing ";"
Martin Maechler <[EMAIL PROTECTED]> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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