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Re: Bug in IDL's TIMEGEN function [message #55583]

Fri, 24 August 2007 15:19

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

Hi Dave,

Good catch! This is indeed a bug. I've just fixed the code for the
next IDL release.

If you want, you can patch your copy of timegen. Go to your $IDL_DIR/
lib/timegen.pro.
Around line 400, replace the following bad lines:
monthArray = (monthArray MOD 12) + 1
IF (step_size LT 0) THEN monthArray = (monthArray + 12) MOD 12
With the following good lines:
if (step_size ge 0) then begin
monthArray = (monthArray mod 12) + 1
endif else begin
monthArray = (((monthArray mod 12) + 12) mod 12) + 1
endelse

Using this version, I get the following results:
IDL> MyTimes = TIMEGEN( units="Months", step_size=-1, $
IDL> start=julday(1,15,2007), final=julday(10,15,2006))
IDL> print, MyTimes - MyTimes(0)
0.00000000 -31.000000 -61.000000 -92.000000

Hope this didn't cause you too many problems.
Cheers,

Chris Torrence
ITT Visual Information Solutions

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[Message index]

		Re: Bug in IDL's TIMEGEN function By: chris_torrence@NOSPAM on Fri, 24 August 2007 15:19
		Re: Bug in IDL's TIMEGEN function By: David Fanning on Fri, 24 August 2007 14:24
		Re: Bug in IDL's TIMEGEN function By: Dave Wuertz on Mon, 27 August 2007 10:01
		Re: Bug in IDL's TIMEGEN function By: R.G.Stockwell on Mon, 27 August 2007 09:41

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