how to access cell array data with single for loop

Question

singh 2015-4-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/213772-how-to-access-cell-array-data-with-single-for-loop

回答： Thorsten 2015-4-27

 A={1;{2,3};{4,5}} %cell array
 B={11,12);{13,14};15}   %cell array
 C = cell( size(A));
 D = cell( size(B));
 for ii=1:length(A)
     C(ii) = A(ii);
     D(ii) = B(ii);
 end

i wish to use only one for loop and i get output from this code is

 when iteration ii =1 then 
C=1
D=11
 iteartion ii=2 then 
C=2
D=12
 iteratioin ii=3 then
C=3
D=13
 iteration ii=4 then
C=4
D=14
 iteartion ii=5
C=5
D=15

i need only one for loop whole process

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Guillaume 2015-4-27

在 MATLAB Online 中打开

Why do you want to use a loop in the first place? Assuming A and B are the same size, your code is the same as

C = A;
D = B;

If A and B are not the same size, in particular if the largest dimension of A is greater than the number of elements in B, then your code will error, since you use the A dimension to access the B dimension.

Finally, I wouldn't use length. I would use numel for vectors.

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Answer 1

Thorsten 2015-4-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/213772-how-to-access-cell-array-data-with-single-for-loop#answer_176832

在 MATLAB Online 中打开

C = flatten(A);
D = flatten(B);

using my function

function [y, me] = flatten(x)
%FLATTEN Flatten numeric data (ND matrices or arbitrarily nested cells)
%
%   [Y, ME] = FLATTEN(X)
%
%Sample usage:
%  A={1; {2,3}; {4,5}; {6,{7,8}}}
%  flatten(A)
%
%   Thorsten.Hansen@psychol.uni-giessen.de  2015-04-27
if ~iscell(x)
  y = x(:);
else
  y = [];
  for i = 1:numel(x)
    try
      xi = cell2mat(x{i});
    catch me
      xi = flatten(x{i});
    end
    y(end+1:end+numel(xi)) = xi;
  end
end