Hello Antoine,
Why not write:
padded_b=zeros(2,2,9);
padded_b(:,:,4:6)=b;
?
S.
Le 08/10/2018 à 14:13, [email protected] a écrit :
Hi all,
I'm trying to stack (or concatenate) 3D matrices (hypermatrices) along
the 3rd dimension.
(The goal is to perform zero-padding along the 3rd dimension).
So far, the only - and ugly - solution I've found is the following:
//my padding
a=zeros(2,2,3);
//my data
b=a;
b(:,:,1)=[111,112;121,122];
b(:,:,2)=[211,212;221,222];
b(:,:,3)=[311,312;321,322];
// zero-padded data
padded_b=matrix([a(:);b(:);a(:)],[size(a,1),size(a,2),3*size(a,3)]);
Is there a solution that is less convoluted (and maybe more efficient)
than resorting to this mix of "(:)" and "matrix"?
Thanks in advance,
Antoine
PS: If you are curious, I'm looking at the time evolution of a 2D
image and need to do zero-padding and fft for spectral analysis : the
2 first dimensions are space ones (x,y), while the 3rd one is temporal
evolution.
--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet
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