sum every 2 pages at a time in 3D matrix
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I'm trying to sum every 2 pages at a time in 3D data.
for example, suppose I have 3x2x5 double data like this:
data = ones(3,2,5);
after I sum every 2 pages then I can get 3x2x3 double data like this:
data(:,:,1) =
2 2
2 2
2 2
data(:,:,2) =
2 2
2 2
2 2
data(:,:,3) =
1 1
1 1
1 1
I'm not sure you can understand what I'm saying..please leave comment if you need more explanation.
The JPG file I attached(pic.jpg) might help you understand.
Many thanks to all
0 commentaires
Réponse acceptée
James Tursa
le 13 Juil 2018
Modifié(e) : James Tursa
le 13 Juil 2018
Another way:
p = 2; % number of pages at a time to sum
datas = data;
m = mod(size(datas,3),p);
if( m )
datas(end,end,end+p-m) = 0; % pad if needed
end
datas = reshape(datas,size(datas,1),size(datas,2),p,size(datas,3)/p);
result = sum(datas,3);
result = reshape(result,size(data,1),size(data,2),[]);
0 commentaires
Plus de réponses (1)
Rik
le 13 Juil 2018
The code below isn't the most efficient for your example, but will work in more complicated situations.
data = ones(3,2,5);
k=2;%number of last dimension to be summed
d=numel(size(data));sumdata_part=cell(k,1);
for k2=1:k
% This part doesn't support other dimensional examples,
% but that can be done as well if you need it to.
sumdata_part{k2}=data(:,:,k2:k:end);
end
%ensure same sizes
temp=zeros(size(sumdata_part{1}));
temp(1:numel(sumdata_part{end}))=sumdata_part{end};
sumdata_part{end}=temp;
%concatenate in a new direction and sum over that dimension
outcome=sum(cat(d+1,sumdata_part{:}),d+1)
0 commentaires
Voir également
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!