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Ordered index array [message #45445]

Wed, 07 September 2005 08:40

Emmanuel Christophe is currently offline

Emmanuel Christophe
Messages: 11
Registered: March 2004

Junior Member

Hi,

I would like to change the values on an array according to the order
they appear. Following this example:

starting with the array
[3,6,2,1,2,8,1,1]
I would like to get
[1,2,3,4,3,5,4,4]

3 being the first value seen it is affected to 1
6 being the second, affected to 2
...

I guess this process is similar to lookup tables, or color tables. As I
would like to process quite big arrays (>60000 long elements), i'm
looking for an efficient function. I don't really know what to look for
in IDL help to find something which could help.

Thanks in advance for any suggestion !

Emmanuel

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Ordered index array

By: Emmanuel Christophe on Wed, 07 September 2005 08:40

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