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Re: the sky is falling down again [message #52416 is a reply to message #52378]

Thu, 01 February 2007 11:10

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Wed, 31 Jan 2007 15:56:50 -0600, Kenneth Bowman wrote:

> In article <pan.2007.01.31.20.17.22.400474@as.arizona.edu>,
> JD Smith <jdsmith@as.arizona.edu> wrote:
>
>> On Wed, 31 Jan 2007 11:30:57 -0700, David Fanning wrote:
>>
>>> Where else can people go when they want
>>> to count angles on the head of a pin? :^)
>>
>> I prefer counting them in radians, because !RADEG is single precision
>> floating point.
>
> Thanks for chaffing David, JD. I refrained. ;-)
>
> IDL has a built-in double precision value of Pi, so I include
>
> DEFSYSV, '!DDTOR', !DPI/180.0D, 1
> DEFSYSV, '!DRADEG', 180.0D/!DPI, 1
>
> in my startup.pro.

Good idea. I'm always starting programs with RADEG=180.D/!DPI, but a
SYSVAR is a better idea. Come to think of it, why don't you suggest
to ITTVIS to add those? It's a rare coordinate calculation in
astronomy that doesn't require double float precision in radians.

JD

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[Message index]

		the sky is falling down again By: R.Bauer on Tue, 30 January 2007 05:20
		Re: the sky is falling down again By: Kenneth Bowman on Thu, 01 February 2007 12:13
		Re: the sky is falling down again By: JD Smith on Thu, 01 February 2007 11:10
		Re: the sky is falling down again By: news.qwest.net on Thu, 01 February 2007 11:06
		Re: the sky is falling down again By: Kenneth Bowman on Wed, 31 January 2007 13:56

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