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Re: Recursive function/procedure [message #15150 is a reply to message #15133]

Fri, 23 April 1999 00:00

Martin Schultz
Messages: 515
Registered: August 1997

Senior Member

Tri VU KHAC wrote:
>
> Hi folks,
> How to write a recursive function/procedure ?
> What are programming problems of this technique in IDL ?
> Thanks for help.
> Best regards,
> Tri

since the first question has been answered let me address the second
one:
as always with recursive procedures, you must take care not to run into
infinite loops (and there is some limitation as to how many recursions
you can make although I don't know the number now). Hence, a "safe"
recursive procedure would look like this:

pro recurse,level

MAX_LEVEL = 1000 ; or whatever is reasonable

if (n_elements(level) eq 0) then level = 0 ; main entry level
if (level gt MAX_LEVEL) then begin
message,'Maximum number of iterations exceeded!' ; optional +
,/Continue
return
endif

; *** do your stuff here

recurse,level+1

; *** do more stuff here

return
end

Regards,
Martin.

--
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Dr. Martin Schultz
Department for Engineering&Applied Sciences, Harvard University
109 Pierce Hall, 29 Oxford St., Cambridge, MA-02138, USA

phone: (617)-496-8318
fax : (617)-495-4551

e-mail: mgs@io.harvard.edu
Internet-homepage: http://www-as.harvard.edu/people/staff/mgs/
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[Message index]

		Re: Recursive function/procedure By: Brian Jackel on Sat, 24 April 1999 00:00
		Re: Recursive function/procedure By: VU KHAC Tri on Sat, 24 April 1999 00:00
		Re: Recursive function/procedure By: Martin Schultz on Fri, 23 April 1999 00:00
		Re: Recursive function/procedure By: ronn on Fri, 23 April 1999 00:00
		Re: Recursive function/procedure By: mgs on Fri, 23 April 1999 00:00
		Re: Recursive function/procedure By: wbiagiot on Fri, 23 April 1999 00:00

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