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Re: Concatenating arrays across chosen dimension [message #31247 is a reply to message #31240]

Wed, 26 June 2002 13:53

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

Hi Reimar,

Nice to see how similar our routines are!

If large arrays are involved, it looks like mine might be a bit quicker, since I
happened to do the concatenation as the vector of 'a' elements with the vector
of 'b' elements. There is no shuffling of data elements to be done, all of 'b'
is just put after all of 'a'. You used concatenation on the first dimension
(dimension 0) with 'c=[at,bt]', which requires IDL to do more work in composing
the result. Every row of the result takes elements from 'a' then 'b'.

The most efficient way would be to do the concatenation on the last dimension,
but the fact that we can't do this in general is the problem that got us here in
the first place!

"Reimar Bauer" <R.Bauer@fz-juelich.de> wrote...
> Dick Jackson wrote:
>>
>> "Randall Skelton" <rhskelto@atm.ox.ac.uk> wrote...
>>
>>> Ok... I have to ask. Is there actually a nice, clean way to concatenate
>>> multidimensional arrays in IDL?
>>>
>>> a = make_array(2,2,2,2)
>>> b = make_array(2,2,2,5)
>>>
>>> data1 = [ [[[a]]] , [[[b]]] ]
>>>
>>> Obviously the above fails, but what is the solution? Surely some
>>> combination of rebin/reform...
>
> Dear Dick,
>
> we have written a general routine to concatinate on each dimension you
> want.
>
>
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download
/concatenate_arrays.tar.gz
>
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download
/concatenate_arrays.sav

Cheers,
--
-Dick

Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392

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[Message index]

		Re: Concatenating arrays across chosen dimension By: R.Bauer on Thu, 27 June 2002 00:30
		Re: Concatenating arrays across chosen dimension By: Dick Jackson on Wed, 26 June 2002 13:53
		Re: Concatenating arrays across chosen dimension By: Randall Skelton on Wed, 26 June 2002 06:33
		Re: Concatenating arrays across chosen dimension By: R.Bauer on Wed, 26 June 2002 00:18
		Re: Concatenating arrays across chosen dimension By: Craig Markwardt on Tue, 25 June 2002 16:05
		Re: Concatenating arrays across chosen dimension By: Paul Van Delst[1] on Tue, 25 June 2002 15:08

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