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Re: Indices ? [message #41918 is a reply to message #41917]

Wed, 01 December 2004 09:06

George N. White III is currently offline

George N. White III
Messages: 56
Registered: September 2000

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On Wed, 1 Dec 2004, Pepe wrote:

> On this very newsgroup Matt McCabe once wrote: " I always get nervous
> posting to this site for fear of asking a particularly stupid
> question....well, here goes."
>
> Well, let me say that I feel the very same way...
>
> I have the following situation:
> a = fltarr(x, y) ;say satellite sea surface temperature data
> b = fltarr(x) ;say the longitude points of the grid
> c = fltarr(y) ;say the latitude points of the grid
>
> data_valid = where(a GT 0.0) ;search for the valid sst values

On a cold Canadian December day it would be nice to thnk that somewhere
in the world you can assume SST>0.

> I need to know the longitude "b(lon_valid)" and latitude
> "c(lat_valid)" points of the valid sst values "a(data_valid)".
> How can I get to them ?

David gave one approach. I sometimes find it helpful, e.g,
to apply criteria such as "lon > 0.5*lat", to create
arrays with all rows(lon)/columns(lat) the same:

lon=b#transpose(1+lonarr(y))
lat=(1+lonarr(x))#transpose(c)

--
George N. White III <aa056@chebucto.ns.ca>
Head of St. Margarets Bay, Nova Scotia, Canada

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[Message index]

		Re: Indices ? By: Chris Lee on Thu, 02 December 2004 12:44
		Re: Indices ? By: sdj on Thu, 02 December 2004 10:01
		Re: Indices ? By: tam on Thu, 02 December 2004 10:54
		Re: Indices ? By: David Fanning on Thu, 02 December 2004 08:31
		Re: Indices ? By: sdj on Thu, 02 December 2004 08:03
		Re: Indices ? By: David Fanning on Wed, 01 December 2004 09:22
		Re: Indices ? By: George N. White III on Wed, 01 December 2004 09:06
		Re: Indices ? By: David Fanning on Wed, 01 December 2004 04:58

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