| Re: CONTINUE from function within loop [message #86480 is a reply to message #86478] |
Tue, 12 November 2013 22:32  |
Moritz Fischer
Messages: 32
Registered: June 2013
|
Member |
|
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Hi,
If this was possible, it would make your myfun routine very hard to reuse.
Why don't you add a keyword to MYFUN ?
Replace the loop by
%<---------------------
FOR i=0, 10 DO BEGIN
tmp = myfun(i, FAILED=FAILED, MSG=MSG)
IF FAILED THEN BEGIN
message, MSG, /INFO
CONTINUE
ENDIF ELSE print, tmp
ENDFOR
%<---------------------
where
%<---------------------
FUNCTION MYFUN, X, FAILED = FAILED, MSG=MSG
[BODY]
FAILED = [condition]
IF FAILED THEN BEGIN
MSG = 'A problem with X',
RETURN, !NULL
ENDIF
[REST IF OK]
RETURN, [something]
END
%<---------------------
But this does not work if MYFUN actually runs into an error ( but only
if [condition] is true ) .
What's wrong with putting thte following into the FOR loop?
%<---------------------
CATCH, err
IF err NE 0 THEN BEGIN
message, !error_state.message, /INFO
CATCH, /cancel
CONTINUE
ELSE print, myfun(i)
%<---------------------
I think (hope) this is the only way you can jump to another level.
cheers
Am 13.11.2013 06:19, schrieb Sebastian Luque:
> Hi,
>
> I read the CATCH and ON_ERROR help pages, but I can't see how to
> handle the following situation. Say we have a FOR loop where a
> function is called for each iteration:
>
> FOR i=0, 10 DO BEGIN print, myfun(i) ENDFOR
>
> I would like MYFUN to continue with the next iteration if it runs
> into an error. Naively, this should show what I'm looking for:
>
> FUNCTION MYFUN, X
>
> [BODY]
>
> IF [condition] THEN BEGIN message, 'A problem with X',
> /informational CONTINUE ENDIF
>
> [REST IF OK]
>
> RETURN, [something]
>
> END
>
> But, of course, CONTINUE only works within an FOR/ENDFOR block, not
> this way. How does one accomplish this?
>
> Thanks, Seb
>
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