Convert cell-array to array-of-cells, for array-of-struct creation?

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Bjoern
Bjoern 2014-6-17
评论： Bjoern 2014-6-19
Hi, how can I convert a cell-array to an array-of-cells?
I have (following a file textscan) a cell array of format:
Fr = [{uint8([1;2;3])}, {uint32([4;5;6])}, {[7;8;9]}]
And need to get to this array of cells:
To = [{Fr{1,1}(1), Fr{1,2}(1), Fr{1,3}(1)} ;...
{Fr{1,1}(2), Fr{1,2}(2), Fr{1,3}(2)} ;...
{Fr{1,1}(3), Fr{1,2}(3), Fr{1,3}(3)}]
..without having to loop (Fr can be large) through Fr.
The reason is that I want an array-of-struct, rather than struct-of-array. Reference:
Incorrect = cell2struct(Fr,{'f1','f2','f3'},2)
Correct = cell2struct(To,{'f1','f2','f3'},2)

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2014-6-18
Fr = [{uint8([1;2;3])}, {uint32([4;5;6])},...
{[7;8;9]}, {uint8([11,12;13,14;15,16])}];
To = cellfun(@(x)num2cell(x,2),Fr,'un',0);
out = [To{:}];
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Azzi Abdelmalek
Azzi Abdelmalek 2014-6-18
Sorry Andrei, I didn't read completly the explanation given by Bjoern. There is no doubt about your result, I misunderstood the new question.
Bjoern
Bjoern 2014-6-19
Excellent, thanks a lot! Just FYI for other users:
This proposal is about 60% quicker than Cedric's proposal. Both produced the same result :)

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更多回答（2 个）

Cedric
Cedric 2014-6-17
To = cellfun( @(cc)num2cell(cc), Fr, 'UniformOutput', false ) ;
To = [To{:}] ;
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Cedric
Cedric 2014-6-18
See Andrei's answer, NUM2CELL can take a second "dim" argument and I didn't know that!

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Azzi Abdelmalek
Azzi Abdelmalek 2014-6-17
编辑：Azzi Abdelmalek 2014-6-17
To=num2cell([Fr{:}])
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Bjoern
Bjoern 2014-6-17
Thanks once again! Please see the comment (for Cedric) on me missing to mention an important fact. It looks like your proposal removes the last column.
Azzi Abdelmalek
Azzi Abdelmalek 2014-6-18
Fr = [{uint8([1;2;3])}, {uint32([4;5;6])},...
{[7;8;9]}, {uint8([11,12;13,14;15,16])}]
mm=cellfun(@(x) size(x,2),Fr)
nn=1:numel(mm)
r=size(Fr{1},1)
dd=cell2mat(arrayfun(@(x,y) [1:x;y*ones(1,x)],mm,nn,'un',0))
[i1,j1]=meshgrid(dd(1,:),1:r)
[i2,j2]=meshgrid(dd(2,:),1:r)
out=arrayfun(@(x,y,z) Fr{x}(y,z),i2,j1,i1,'un',0)

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