how to convert cell array to a matrix?

2018 7 30
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更新时间：2018 8 1
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I have a 5X4 matrix whose each element is a cell array. how to convert it to a simple matrix of elements.

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Bhowmik.U
Bhowmik.U 2018-7-30
try if this works
X=cell{5,4} %your cell Y=cell2mat(X) % your desired matrix
Stephen23
Stephen23 2018-7-30
@Zara Khan: what size would you expect the output to be? Would padding be acceptable to you? If so, with what value?
KSSV
KSSV 2018-7-30
Attach data instead of image snippet..have a look on Cell2mat
Zara Khan
Zara Khan 2018-7-30
I want to access this matrix as row by row
Zara Khan
Zara Khan 2018-7-31
Bhowmik U: No its not working as we cant use cell for cell arrays.

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回答（1 个）

Jos (10584)
Jos (10584) 2018-7-30

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A = {[1 2 3],[4 5],6 ; [11 12],13,[] ; 21, [22 23], [24 25]} % data
B = arrayfun(@(k) cat(2,A{k,:}),1:size(A,1),'un',0) % make row vectors
C = padcat(B{:}) % pad vectors with NaNs
My function PADCAT can be downloaded here: https://uk.mathworks.com/matlabcentral/fileexchange/22909-padcat-varargin

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Zara Khan
Zara Khan 2018-7-31
编辑：Zara Khan 2018-7-31
its nice. But how to use this codes when I dont have some predefined values. Like I have a code:
d{i,j}=diff(A{i,j});
Now I want to make this d as simple matrix instead of cell arrays. How I will use your above codes in this case?
Jos (10584)
Jos (10584) 2018-7-31
use d instead of A to create B ... I am no sure if I understand your problem though ...
Zara Khan
Zara Khan 2018-7-31
How this will be when I am retrieving data from a loop ? If I use d instead of A then still I am using some predefined values.
Jos (10584)
Jos (10584) 2018-7-31
At some point you will have a cell array with values, won't you? Then you can transform it as above.
Zara Khan
Zara Khan 2018-7-31
yes that can be done using the above code. But what about when I am storing values from loops?
Jos (10584)
Jos (10584) 2018-8-1
This is all rather vague ... Can you show us some code, showing where you get stuck?

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