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Re: some multi-dimensional matrix problem

From: David Bateman
Subject: Re: some multi-dimensional matrix problem
Date: Tue, 25 May 2004 16:03:37 +0200
User-agent: Mutt/1.4.1i

According to Bart Vandewoestyne <address@hidden> (on 05/24/04):
> Thanks for the hint, but I would like to have the transposed of what you
> propose.  I know I can transpose it after the reshape, but my guess was
> that this takes some time, and since time is important in my
> calculations, i was wondering if there isn't a faster way to get my
> result.  the 'squeeze' command also gives the same result as yours...
> Isn't there a way to tell reshape to start filling row-wise instead of
> column-wise?  Or another way to get what i want?
> Regards,
> Bart

All the functions squeeze and reshape do is change the dim_vector for
the octave_value, without touching the underlying data which is stored
essentially as a vector. So there is no transpose involved, and it is
thus a low cost operation. If what you want is the transpose of this
then you have no choice you must touch the underlying data, thus
"transpose(squeeze(x))" is probably optimal.


David Bateman                                address@hidden
Motorola CRM                                 +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 1 69 35 77 01 (Fax) 
91193 Gif-Sur-Yvette FRANCE

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