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Re: A strange error with WHERE [message #67484 is a reply to message #67482]

Thu, 30 July 2009 20:22

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Lindzen writes:

> I come across a strange error with WHERE function. Could you
> please help me to check it?
> Here is part of the code. I will explain below the code.
>
> outer1_begin: id_hr = where(r03_temp ge 50)
> n_hr = n_elements(id_hr)
>
> if (n_elements(id_hr) gt 1) then begin
> id_max = where(r03_temp eq max(r03_temp))
> lonc = lon_aoc(id_max)
> latc = lat_aoc(id_max)
>
> ii=0
> outer2_begin: print,ii
> ii=ii+1
> lon_left = lonc-ii*0.5
> lon_right = lonc+ii*0.5
> lat_up = latc+ii*0.5
> lat_down = latc-ii*0.5
> id_box = where(lon_aoc ge lon_left)
>
> Here lon_left=117.25, is a flot number. lon_aoc is a 80*30 matrix,
> with many values larger than 117.25.
> If I use id=where(lon_aoc ge 117.25), id returns right results.
> However, the above code returns -1 to id_box. It is really strange.
> Could anyone help me? Thank you very much!

There is nothing wrong with the WHERE function.
There is (certainly) something wrong with one
of your assumptions. You will need to discover
which one it is. The HELP and PRINT commands are
useful for this chore.

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.")

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[Message index]

		Re: A strange error with WHERE By: Lindzen on Thu, 30 July 2009 21:24
		Re: A strange error with WHERE By: David Fanning on Thu, 30 July 2009 21:11
		Re: A strange error with WHERE By: Lindzen on Thu, 30 July 2009 20:50
		Re: A strange error with WHERE By: David Fanning on Thu, 30 July 2009 20:44
		Re: A strange error with WHERE By: Lindzen on Thu, 30 July 2009 20:33
		Re: A strange error with WHERE By: David Fanning on Thu, 30 July 2009 20:22
		Re: A strange error with WHERE By: Paul Van Delst[1] on Fri, 31 July 2009 12:46

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