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Re: DOUBLE precision no precise?? [message #29610 is a reply to message #29609]

Tue, 05 March 2002 07:32

Robert Stockwell
Messages: 74
Registered: October 2001

Member

David Williams wrote:

...
> To try and find where the problem is, we tried the following lines...
>
> IDL> a = DOUBLE(42766.080001)
> IDL> print,a,FORMAT='(F24.17)'
>
> 42766.07812500000000000
>
...
> Dave
>
> ------------------------------------------------------------ ---------
> David R. Williams, | BT7 1NN, Northern Ireland.
> Astrophysics & Planetary Science, | d.williams@qub.ac.uk
> Queen's University, Belfast, | http://star.pst.qub.ac.uk/~drw/
> ============================================================ =========
>

IDL> a = DOUBLE(42766.080001)
This statements is the same as a = DOUBLE(FLOAT(42766.080001))
since that is how it gets parsed by IDL. This is how it should work
since you did not define the constant as a double (although
people could argue that double should be the default type).

Anyways, this is what you want to do (note the "d" at the end
of the number).

IDL> print,42766.080001d,format='(f24.12)'
42766.080001000002

Cheers,
bob

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[Message index]

		Re: DOUBLE precision no precise?? By: Pete[1] on Tue, 05 March 2002 13:11
		Re: DOUBLE precision no precise?? By: dave_r_williams on Tue, 05 March 2002 09:20
		Re: DOUBLE precision no precise?? By: James Kuyper on Tue, 05 March 2002 08:29
		Re: DOUBLE precision no precise?? By: William Clodius on Tue, 05 March 2002 08:11
		Re: DOUBLE precision no precise?? By: Robert Stockwell on Tue, 05 March 2002 07:32
		Re: DOUBLE precision no precise?? By: Martin Downing on Tue, 05 March 2002 06:30
		Re: DOUBLE precision no precise?? By: Vincent Schut on Tue, 05 March 2002 07:07
		Re: DOUBLE precision no precise?? By: R.Bauer on Tue, 05 March 2002 06:07
		Re: DOUBLE precision no precise?? By: Vincent Schut on Tue, 05 March 2002 05:01
		Re: DOUBLE precision no precise?? By: James Tappin on Tue, 05 March 2002 04:14

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