Create a Matrix from different ccella array.

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Fredic 2020-7-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/570013-create-a-matrix-from-different-ccella-array

评论： madhan ravi 2020-7-24

I have a cell array "data" 1x3 cell, each cell having different number of elements with 4 columns. for example data= [13252*4 double];[1516*4] double;[1244*4]double.

Now, I need a matrix which has maximum number of columns equal to 12 (sum of single columns) and rows equal to the maximum number of columns of all the cells. and I want to insert Nan when there is not value.

Thank you so much!!!

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Fredic 2020-7-24

I try this code

nCol   = cellfun('size', data,1);
nRow   = numel(data) ;
Output = NaN(max(nCol), nRow);
for iA = 1:numel(data)
  idx = (iA - 1)  + 1;
  Output(1:nCol(iA), idx:idx+1) = data{iA};
end

But then appers this error

Unable to perform
assignment because the
size of the left side is
1352-by-2 and the size of
the right side is
1352-by-4.
Error in Fitting_function
(line 44)
  Output(1:nCol(iA),
  idx:idx+1) = data{iA};
 

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采纳的回答

KSSV 2020-7-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/570013-create-a-matrix-from-different-ccella-array#answer_470356

A{1} = rand(10,4) ; 
A{2} = rand(5,4) ; 
A{3} = rand(6,4) ; 
% Get length of each cell 
L = cellfun(@length,A) ; 
for i = 1:length(L)
  if size(A{i},1) < max(L)
    T = NaN(max(L),4) ; 
    T(1:L(i),:) = A{i} ; 
    A{i} = T ; 
  end  
end
iwant = [A{:}] ; 