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IDL's BESELJ returns NAN for small argument and large order [message #88070]

Tue, 18 March 2014 07:55

David Ruffner
Messages: 2
Registered: March 2014

Junior Member

Hi all,
I found what I think is a bug in IDL's BESELJ function when there is small argument and large order. For instance,

IDL> print,beselj(0.1d,103.d)
NaN
% Program caused arithmetic error: Floating underflow.

I think the problem is that the number is too small for IDL to handle because if I do a smaller order then the result is a very small number,

IDL> print,beselj(0.1d,102.d)
2.0511844e-295
% Program caused arithmetic error: Floating underflow.

Shouldn't IDL just return zero in this case? Any thoughts would be helpful.

Thanks,
David

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[Message index]

		IDL's BESELJ returns NAN for small argument and large order By: David Ruffner on Tue, 18 March 2014 07:55
		Re: IDL's BESELJ returns NAN for small argument and large order By: Phillip Bitzer on Tue, 18 March 2014 16:47
		Re: IDL's BESELJ returns NAN for small argument and large order By: David Ruffner on Wed, 19 March 2014 13:48
		Re: IDL's BESELJ returns NAN for small argument and large order By: dg86 on Thu, 20 March 2014 17:27

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