comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Re: GRIDDATA woes

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: GRIDDATA woes [message #59026]

Tue, 04 March 2008 13:14

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Kenneth P. Bowman writes:

>> Compute the "interpolation coordinates" from the original grid
>> j �= VALUE_LOCATE(y_original, y)
>> yj = j + (y - y_original[j])/(y_original[j+1] - y_original[j])

To tell you the truth, I can't get this to work at all. :-(

IDL> lat = [-87.5, 50, 25, 0, 30, 45, 64, 87.5]
IDL> y = Scale_Vector(findgen(7), -87.5, 87.5)
IDL> j = Value_Locate(lat, y)
IDL> yj = j + (y - lat[j])/(lat[j+1] - lat[j])
% Program caused arithmetic error: Floating illegal operand
IDL> print, yj
0.000000 0.212121 0.424242 3.00000 3.97222 5.70175 -NaN

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Report message to a moderator

[Message index]

		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 13:14
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 11:49
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 09:54
		Re: GRIDDATA woes By: wgallery on Tue, 04 March 2008 09:43
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 09:14
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 09:05
		Re: GRIDDATA woes By: Brian Larsen on Tue, 04 March 2008 08:23
		Re: GRIDDATA woes By: ben.bighair on Tue, 04 March 2008 08:05
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 08:03
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 07:35
		Re: GRIDDATA woes By: Kenneth P. Bowman on Mon, 03 March 2008 06:24
		Re: GRIDDATA woes By: wgallery on Mon, 03 March 2008 11:00
		Re: GRIDDATA woes By: Kenneth P. Bowman on Tue, 04 March 2008 19:04
		Re: GRIDDATA woes By: Kenneth P. Bowman on Tue, 04 March 2008 19:02
		Re: GRIDDATA woes By: wgallery on Tue, 04 March 2008 14:17
		Re: GRIDDATA woes By: Kenneth Bowman on Wed, 05 March 2008 06:14
		Re: GRIDDATA woes By: Kenneth P. Bowman on Tue, 04 March 2008 18:55
		Re: GRIDDATA woes By: ben.bighair on Tue, 04 March 2008 14:46
		Re: GRIDDATA woes By: pgrigis on Tue, 04 March 2008 14:39

Previous Topic:	Re: Speeding up a call to the where function
Next Topic:	GRIDDATA woes

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 10:54:30 PDT 2025

Total time taken to generate the page: 0.80048 seconds