How to convert cell to matrix

Question

Ede gerlderlands 2013-7-16

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评论： Tehmina Kakar 2018-7-18

I have a cell which is given by A= 1x13cell. I want to extract the contents of the cell into the form of a matrix of size (13 x number of points each cell containd) is this possible? The number of points in each cell varies. Can you help me with this?

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Jos (10584) 2013-7-16

在 MATLAB Online 中打开

I suggest you give a small example. For instance, if

C = {[1 2],[11 12 13]} % a cell array

how would you like the final matrix M to look like? Something like

1   2  NaN
11  12   13

?

Ede gerlderlands 2013-7-16

yes, that's what I need

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Answer 1

Jan 2013-7-16

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编辑：Jan 2013-7-16

在 MATLAB Online 中打开

N = cellfun('length', C);
M = numel(C);
R = NaN(M, N);
for k = 1:M
  R(1:N(k)) = C{k};  % Perhaps: reshape(C{k}, 1, [])
end

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Ede gerlderlands 2013-7-16

编辑：Ede gerlderlands 2013-7-16

Thank you for yor reply. But this gives me the whole nubers that are found in the cell in the decending order following rows. What I really want is the numbers per cell . That is 13 rows and what is found in them . Thank you

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Answer 2

David (degtusmc) 2013-7-16

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编辑：David (degtusmc) 2013-7-16

Look up cell2mat. The link for the documentation is below. I hope this helps

http://www.mathworks.com/help/matlab/ref/cell2mat.html

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Evan 2013-7-16

This will only work for cells arrays containing matrices of constant size in each array.

David (degtusmc) 2013-7-18

That is true. I did not think about that. Thank you Evan.

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Answer 3

Jos (10584) 2013-7-17

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https://ww2.mathworks.cn/matlabcentral/answers/82221-how-to-convert-cell-to-matrix#answer_91990

编辑：Jos (10584) 2013-7-17

在 MATLAB Online 中打开

Here is a suggestion

C = {[1 2 ;3 4],[11 12 13].',100:106} % a cell array
% make sure all elements are column vectors 
C2 = cellfun(@(x) reshape(x,[],1), C,'un',0) ; 
M = padcat(C2{:})