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Re: subscripting arrays [message #46417 is a reply to message #46258]

Tue, 22 November 2005 01:36

Chris Lee
Messages: 101
Registered: August 2003

Senior Member

Benjamin Hornberger wrote:
> Hi all,
>
> this is probably simple, but I can't figure it out right now:
>
> I want to extract an element from a 2d array, and I have the 2d
> subscripts of that element available as a 2-element vector.
>
> IDL> a = dist(300)
> IDL> b = [30, 50]
> IDL> print, a[b]
> 30.0000 50.0000
>
> Not what I want. What I want is
>
> IDL> print, a[b[0], b[1]]
> 58.3095
>
> Is there a more elegant way than splitting b up?
>
> Thanks,
> Benjamin

You can get the correct answer using the one-dimensional index.

a=dist(300)
b=[30,50]
scale=[1,300]
print, a[total(b*scale)]

but it's not very elegant.

Chris.

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		subscripting arrays By: Benjamin Hornberger on Sun, 13 November 2005 20:47
		Re: subscripting arrays By: Chris Lee on Tue, 22 November 2005 01:36

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