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Re: WRONG RESULTS WITH IDL [message #11765 is a reply to message #11714]

Thu, 14 May 1998 00:00

Anders Johannesson
Messages: 3
Registered: May 1998

Junior Member

Frank Loewenthal wrote in message <354ef5cc.356842983@news>...
> Hi Folks
>
> For calculation of beam-propagation I use IDL. But now I realize that
> for large arguments, even with double-precision, IDL gives wrong
> results:
> For example:
>
> sin(12345678901.12345678901) = -03727 9004 9960 8007
>
> where IDL get:
>
> IDL> x = double(12345678901.12345678901)
> IDL> print, sin(x)
> 0.098761418
>
> Can somebody confirm this result, and does anybody know the solution
> to overcome this problem?

################################################
You are not using double. Try it this way: (Note the d for double)

print,sin(12345678901.12345678901d)

Anders Johannesson
#################################################

>
> Best regards
>
> Frank

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[Message index]

		WRONG RESULTS WITH IDL By: loewenthal on Tue, 05 May 1998 00:00
		Re: WRONG RESULTS WITH IDL By: Anders Johannesson on Thu, 14 May 1998 00:00

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