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Strange return from where function [message #67977]

Tue, 15 September 2009 22:14

byrne.david
Messages: 3
Registered: November 2007

Junior Member

Hey guys not sure what is going on here.

I have an array with particle IDs to track particles. I want to search
for the particles in the array by thier particle ID.

Simple where call but its being strange. This is what i get

IDL> print,index
1.00000
IDL> wh_track_full=where(tracks[0,*] eq index)
IDL> print, wh_track_full
0
IDL> wh_track_full=where(tracks[0,*] eq 1.0000)
IDL> print, wh_track_full
0 1

So you see it finds all the elements with an ID of 1.000 if i type in
the actual value. But when i assign it to a variable I just pick up
the first element and not the second.

I've never come across this before,

any ideas?

Regards
David

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