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Re: subscript array question [message #14302 is a reply to message #14298]

Thu, 11 February 1999 00:00

eddie haskell
Messages: 29
Registered: September 1998

Junior Member

> I'm using IDL 5.0 and need to be able to use a subscript
> array containing duplicate values like this:
>
> array = intarr(5)
> subs = [0,2,4,4]
> array[subs] = array[subs] + 1
>
> and have the resulting values for array be:
>
> 1 0 1 0 2

How about something like this:
IDL> array = intarr(9)
IDL> subs = [2,3,4,2,4,4,7,5]
IDL> array[min(subs):max(subs)] = array[min(subs):max(subs)] +
histogram(subs)
IDL> print, array
0 0 2 1 3 1 0 1 0

I checked it with arrays up to a size of findgen(100000) and it runs
without
any noticeable time delays. I have not, however, done any error
checking,
i.e., if subs contain elements outside of array, or any real checking of
any
sort for that matter. :-) HTH

cheers,
eddie

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|\ A G Edward Haskell
|\ Center for Coastal Physical Oceanography
|\ Old Dominion University, Norfolk VA 23529
|\ Voice 757.683.4816 Fax 757.683.5550
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[Message index]

		Re: subscript array question By: steinhh on Fri, 12 February 1999 00:00
		Re: subscript array question By: bennetsc on Fri, 12 February 1999 00:00
		Re: subscript array question By: eddie haskell on Thu, 11 February 1999 00:00
		Re: subscript array question By: David Ritscher on Thu, 11 February 1999 00:00

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