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Re: Summer "English" heat or just me: Array slicing [message #85315 is a reply to message #85314]

Wed, 24 July 2013 07:19

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Fabien writes:

> This is what you said 14 years ago ;-)

Sigh... My life wasted.

> I think I understood this part:
>
> ;-Quoting Henry Chapman----------------------------------------------
>
> There are two behaviours you may want when you try result = array[x,
> y,..., z], and x, y, ..., z are 1-d arrays:
>
> 1. return a 1-d array with result[i] = array[x[i], y[i],..., z[i]]
> 2. return a 2-d array with result[i, j,..., k] = array[x[i],
> y[j],...,z[k]]
>
> IDL does (1), which requires x, y,...,z all have the same length.
> However, IDL does (2) if one of the dimensions is a subscript range.
> Since a single number is a subscript range, it will do (2) in that
> case. And since 0, written in as an extra dimension is also a subscript
> range, IDL will use behaviour (2)
> ;----------------------------------------------------------- --------
>
> I must admit that I am only really rarely confronted to cases where I
> can use this, but it is good to know...

I think this has to do with an "index threading" article JD wrote,
although I can't find a reference to it right now.

I guess I do understand it. Sorta. I just don't want to have to explain
it to anyone. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Summer "English" heat or just me: Array slicing By: ameigs on Tue, 23 July 2013 08:51
		Re: Summer "English" heat or just me: Array slicing By: Fabzi on Tue, 23 July 2013 09:12
		Re: Summer "English" heat or just me: Array slicing By: Lajos Foldy on Tue, 23 July 2013 09:16
		Re: Summer "English" heat or just me: Array slicing By: Phillip Bitzer on Tue, 23 July 2013 09:45
		Re: Summer "English" heat or just me: Array slicing By: Fabzi on Wed, 24 July 2013 06:44
		Re: Summer "English" heat or just me: Array slicing By: David Fanning on Wed, 24 July 2013 06:46
		Re: Summer "English" heat or just me: Array slicing By: Fabzi on Wed, 24 July 2013 06:57
		Re: Summer "English" heat or just me: Array slicing By: David Fanning on Wed, 24 July 2013 07:19
		Re: Summer "English" heat or just me: Array slicing By: Fabzi on Wed, 24 July 2013 07:25
		Re: Summer "English" heat or just me: Array slicing By: David Fanning on Wed, 24 July 2013 07:30

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