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Re: ROT is ROTTEN (a solution) [message #28160 is a reply to message #28075]

Wed, 21 November 2001 12:59

Martin Downing
Messages: 136
Registered: September 1998

Senior Member

"William Thompson" <thompson@orpheus.nascom.nasa.gov> wrote in message
news:9tgojk$g7t$1@skates.gsfc.nasa.gov...
> "Martin Downing" <martin.downing@ntlworld.com> writes:
>
>> Hi All,
>
>> This was an interesting problem - I certainly hadn't noticed it before.
The
>> reason for the behaviour is precision error in the arithmatic which works
>> out the poly2d coefficients. It can be corrected effectively by modifying
>> line 128 of rot.pro:
>
>> from:
>
>> theta = -angle/!radeg ;angle in degrees CLOCKWISE.
>
>> to:
>
>> theta = (-angle MOD 360) *acos(0.0d)/90 ;angle in degrees CLOCKWISE.
(mod
>> MRD 21/11/2001 to correct for precision error)
>
> As others have said, great job! Can I make one small suggestion, though.
> Instead of acos(0.0d)/90, can I suggest !dpi/180?
>
> theta = (-angle MOD 360) * !dpi/180
>

Sure, it just seemed kind of fun the other way!

Martin

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[Message index]

		Re: ROT is ROTTEN (a solution) By: Heike Koch-Beuttenmue on Wed, 21 November 2001 05:02
		Re: ROT is ROTTEN (a solution) By: Martin Downing on Wed, 21 November 2001 03:55
		Re: ROT is ROTTEN (a solution) By: Wayne Landsman on Wed, 21 November 2001 20:55
		Re: ROT is ROTTEN (a solution) By: Martin Downing on Wed, 21 November 2001 13:06
		Re: ROT is ROTTEN (a solution) By: Martin Downing on Wed, 21 November 2001 12:59
		Re: ROT is ROTTEN (a solution) By: Wayne Landsman on Wed, 21 November 2001 10:41
		Re: ROT is ROTTEN (a solution) By: thompson on Wed, 21 November 2001 09:34
		Re: ROT is ROTTEN (a solution) By: Paul van Delst on Wed, 21 November 2001 07:19

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