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Re: hor2eq mystery - disagreeing output from same input? [message #66932 is a reply to message #66924]

Wed, 17 June 2009 08:17

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Jun 17, 9:45 am, MichaelT <michael.theus...@googlemail.com> wrote:
> I have run into a problem using the hor2eq. It output different
> results when using single values from an array as input (correct
> output) compared to using the same array as a whole (wrong output).

First, for non-astronomers, hor2eq.pro is a program in the IDL
astronomy library (http://idlastro.gsfc.nasa.gov). The
vectorization was done incorrectly (not by me), or at least it didn't
anticipate all usages. It assumed that the Julian date would be
supplied as a vector with a separate date for each position. (So it
would loop over the number of Julian dates.) But you are giving a
scalar Julian date with vector positions, so all positions except the
first are not being precessed. I have now updated hor2eq.pro to
recognize your case (
http://idlastro.gsfc.nasa.gov/ftp/pro/astro/hor2eq.pro )

--Wayne

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[Message index]

		Re: hor2eq mystery - disagreeing output from same input? By: MichaelT on Wed, 17 June 2009 12:15
		Re: hor2eq mystery - disagreeing output from same input? By: wlandsman on Wed, 17 June 2009 08:17
		Re: hor2eq mystery - disagreeing output from same input? By: Jean H. on Wed, 17 June 2009 07:10

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