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Re: Recursive Function Program in IDL [message #46709 is a reply to message #46708]

Wed, 14 December 2005 08:36

Paolo Grigis
Messages: 171
Registered: December 2003

Senior Member

this computes the binomial coefficients recursively
(the numbers showing up in Pascal's triangle)

FUNCTION binomial,n,j

IF n LT j THEN BEGIN
print,'INVALID INPUT IN BINOMIAL'
RETURN,-1
ENDIF

IF j LE 0 THEN RETURN,1

IF j EQ n THEN $
RETURN,1 ELSE $
RETURN,binomial(n-1,j)+binomial(n-1,j-1)

END

Ciao,
Paolo

David Fanning wrote:
> Folks,
>
> Does anyone have a handy recursive function that does something neat?
> Someone is asking, and I don't have time to work on this. He
> (apparently) can't get to the newsgroup.
>
> Thanks,
>
> David
>

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[Message index]

		Re: Recursive Function Program in IDL By: David Fanning on Wed, 14 December 2005 09:50
		Re: Recursive Function Program in IDL By: news.qwest.net on Wed, 14 December 2005 09:46
		Re: Recursive Function Program in IDL By: Antonio Santiago on Wed, 14 December 2005 09:16
		Re: Recursive Function Program in IDL By: David Fanning on Wed, 14 December 2005 08:51
		Re: Recursive Function Program in IDL By: Paolo Grigis on Wed, 14 December 2005 08:36

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