cell array into 3d matrix

11 vues (au cours des 30 derniers jours)
sumeeth
sumeeth le 17 Avr 2012
Modifié(e) : Andrei Bobrov le 17 Nov 2013
i have a cell array of size 104x104 with each cell having a matrix of size 1x1000. How can i convert this cell into a 3d matrix of size 104x104x1000 ??
  1 commentaire
Sean de Wolski
Sean de Wolski le 17 Avr 2012
+1, good clear question with room for many good approaches

Connectez-vous pour commenter.

Réponses (4)

Hanan Shteingart
Hanan Shteingart le 17 Nov 2013
You can concatenate cell array content using the "cat" function with this syntax: cat(dim, A{:}) where A is your cell array

the cyclist
the cyclist le 17 Avr 2012
Both of these should do the same thing (and I think it is the thing you want). The second is a little bit more transparent, but slower.
B1 = cell2mat(arrayfun(@(x)permute(x{:},[3 1 2]),A,'UniformOutput',false));
B2 = zeros(104,104,1000);
for i = 1:104,
for j = 1:104,
B2(i,j,1:1000) = permute(A{i,j},[1 3 2]);
end
end
  1 commentaire
Sean de Wolski
Sean de Wolski le 17 Avr 2012
Reshape() instead of permute() for speed.

Connectez-vous pour commenter.


Sean de Wolski
Sean de Wolski le 17 Avr 2012
Or the pure matrix manipulation approach:
%Sample Data:
X = reshape(magic(50),1,[]);
C = cell(100,100);
C(:) = {X}; %100 x 100 cell array of xs
%Engine:
D = reshape(reshape(cell2mat(C)',numel(X),numel(C))',size(C,1),size(C,2),numel(X)); %some reshapin'
%Check
all(all(all(bsxfun(@eq,D(1,1,:),D)))) %Is it right?
yay!

Andrei Bobrov
Andrei Bobrov le 17 Avr 2012
Modifié(e) : Andrei Bobrov le 17 Nov 2013
permute(reshape(cell2mat(C).',numel(C{1}),size(C,2),[]),[3 2 1])
or
reshape(cat(1,A{:}),[size(C), numel(C{1})])

Catégories

En savoir plus sur Creating and Concatenating Matrices dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by