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WHERE problems (longish) [message #35914]

Tue, 22 July 2003 08:23

Benjamin Panter
Messages: 6
Registered: August 2002

Junior Member

Hiya,

This is puzzling me, and I've been through all that I can think of. I
have a look up table called "dust_lookup". It is a 2 x 300ish array and
has wavelengths and the corresponding correction factor. I need to pluck
a few values out, so I'm using where:

print, where(2900. eq reform(dust_lookup[*,0]))

which works absolutly fine for most values: unfortunatly not for all:

If I write a little test:

PRO tester, dust_lookup

print, where(2900. eq reform(dust_lookup[*,0]))
print, where(2920. eq reform(dust_lookup[*,0]))
print, where(2940. eq reform(dust_lookup[*,0]))
print, where(2960. eq reform(dust_lookup[*,0]))
print, where(2980. eq reform(dust_lookup[*,0]))
print, where(3000. eq reform(dust_lookup[*,0]))
print, where(3020. eq reform(dust_lookup[*,0]))
print, where(3040. eq reform(dust_lookup[*,0]))
print, where(3060. eq reform(dust_lookup[*,0]))
print, where(3080. eq reform(dust_lookup[*,0]))
print, where(3100. eq reform(dust_lookup[*,0]))

END

it comes out with

IDL> tester, dust_lookup
10
11
12
13
-1
-1
-1
17
18
19
20

The values which have -1 certainly exist - and were generated in exactly
the same way as the others. I've put the array online if anyone fancies
looking at it - http://www.roe.ac.uk/~bdp/where_problem.idl

Am I being stupid again? What is special about 2980,3000 and 3020??

Cheers,

Ben

--
Ben Panter, Edinburgh
My name (no spaces)@bigfoot which is a com.

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[Message index]

		WHERE problems (longish) By: Benjamin Panter on Tue, 22 July 2003 08:23
		Re: Where problem By: d.poreh on Fri, 05 February 2010 04:01
		Re: Where problem By: JJ on Thu, 04 February 2010 08:20
		Re: Where problem By: d.poreh on Thu, 04 February 2010 02:30
		Re: Where problem By: Wout De Nolf on Thu, 04 February 2010 02:26
		Re: Where problem By: Wout De Nolf on Thu, 04 February 2010 02:22
		Re: Where problem By: Foldy Lajos on Thu, 04 February 2010 01:59
		Re: Where problem By: d.poreh on Thu, 04 February 2010 01:47
		Re: Where problem By: Foldy Lajos on Thu, 04 February 2010 01:33

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