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Re: array transpose [message #8788 is a reply to message #8783]

Mon, 21 April 1997 00:00

William Clodius
Messages: 30
Registered: December 1996

Member

David Fanning wrote:
>
> Christian Soeller <csoelle@sghms.ac.uk> writes:
>
>> Gary Fu <gfu@shark.gsfc.nasa.gov> writes:
>>
>>>>
>>>> RTFM -> transpose function
>>>>
>>>> Christian
>>>
>>> The TRANSPOSE function will transpose to array(Z,Y,X), not array(Y,X,Z).
>>
>> And what about transpose(array,[1,0,2]) ?
>> As I said, it's in the manual; one obviously has to know how to read it ;).
>
> What manual are you reading, Christian? Or perhaps more to the point,
> exactly HOW are you reading it!? I don't find this is *my* manual. :-(
>
> In any case, I can't get this to work. Can you perhaps tell us what
> software you are using and give us a simple example.
> <snip>

David:

Assuming you are using IDL and not PV-Wave (PV-Wave might differ on this
point) the Reference Guide or the online documentation accessed by
entering
> ?

both give for the TRANSPOSE function

"The TRANSPOSE function returns the transpose of Array. If an optional
permutation vector is provided, the dimensions of Array are rearranged
as well.

Calling Sequence
Result = TRANSPOSE(Array [, P])

Arguments
...
P
A vector specifying how the dimensions of Array will be permuted.
The elements of P correspond to the dimensions of Array; the ith
dimension of the output array is dimension P(i) of the input array. Each
element of the vector P must be unique. Dimensions start at zero and can
not be repeated.
If P is not present, the order of the indices of Array is
reversed. ...

To see how a multi-dimensional transposition works, first create a
three-dimensional array A:

A = INDGEN(2, 3, 4)

Take the transpose, reversing the order of the indices

B = TRANSPOSE(A)

Now re-order the dimensions of A, so that the second dimension becomes
the first, the third becomes the second and the first becomes the third

C = TRANSPOSE(A, [1, 2, 0])"

--

William B. Clodius Phone: (505)-665-9370
Los Alamos Nat. Lab., NIS-2 FAX: (505)-667-3815
PO Box 1663, MS-C323 Group office: (505)-667-5776
Los Alamos, NM 87545 Email: wclodius@lanl.gov

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[Message index]

		Re: array transpose By: Joseph M Zawodny on Tue, 22 April 1997 00:00
		Re: array transpose By: davidf on Tue, 22 April 1997 00:00
		Re: array transpose By: Christian Soeller on Tue, 22 April 1997 00:00
		Re: array transpose By: brian.jackel on Mon, 21 April 1997 00:00
		Re: array transpose By: Christian Soeller on Mon, 21 April 1997 00:00
		Re: array transpose By: William Clodius on Mon, 21 April 1997 00:00
		Re: array transpose By: davidf on Mon, 21 April 1997 00:00
		Re: array transpose By: dan on Mon, 21 April 1997 00:00
		Re: array transpose By: Gary Fu on Mon, 21 April 1997 00:00
		Re: array transpose By: Christian Soeller on Sun, 20 April 1997 00:00

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