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Creating a 3-dim matrix from an array and a 2-dim matrices array

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Valentina Baljak
Valentina Baljak 2015-4-22
评论： Valentina Baljak 2015-4-22
I am trying to create a 3-dimensional matrix (e.g. 80 x 300 x 350) from an array (dim 80) and an array of 80 300 x 350 matrices. The second dimension in matrices may vary, so it needs to be padded by 0.
Any hint is welcome.
I have tried this:
for i=1:80
res(i,:,:)=cell2mat(s1(i));
end
and got this:
Subscripted assignment dimension mismatch.
Thank you
  2 个评论
James Tursa
James Tursa 2015-4-22
If you are using the 300 x 350 slices downstream in your code, you might consider making those the first two dimensions of your 3D matrix so the slices are contiguous in memory. E.g., a 300 x 350 x 80 array.

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Sean de Wolski
Sean de Wolski 2015-4-22
Close! but using :,: means that it must fill the whole thing, not pad with zeros. Instead, only fill to the size:
for i=1:80
sii = cell2mat(s1(i));
res(i,1:size(sii,1),1:size(sii,2)) = permute(sii,[3 1 2]); % permute to write orientation
end
  1 个评论
Valentina Baljak
Valentina Baljak 2015-4-22
Thank you, that looks like shorter solution. In a meanwhile, I have tried more direct approach, using the coder logic, I guess.
%zero 3D matrix, placeholder predict=zeros(80, 300, 350);
for i=1:80 temp=cell2mat(s1(i)); dims=size(temp); d=dims(2); for j=1:300 for k=1:d predict(i,j,k)=temp(j,k); end end end
and it works well enough.

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