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Cell arrays in MATLAB

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med-sweng
med-sweng 2013-8-7
I know what a cell array is. I just came to the following line: cell_array = cell([], 1);
What does that mean? How can we read the above line?
Thanks.

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回答（3 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-8-7
That means you an empty cell
  1 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2013-8-7
编辑：Azzi Abdelmalek 2013-8-7
The only difference between a={} and b=cell([],10) is their sizes, both do not pre-allocate memory
% size(a)= [0 0]
% size(b)= [0 10]

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Caroline
Caroline 2013-8-7
The cell function creates a cell array. There are multiple ways to use it. In this case it would create an empty cell array. If you typed the following line into the MATLAB command window:
cell_array = cell([], 1);
it would return the following:
cell_array =
Empty cell array: 0-by-1
per isakson
per isakson 2013-8-7
编辑：per isakson 2013-8-7
Create an empty column cell array
>> cell_array = cell([], 1);
>> whos
Name Size Bytes Class Attributes
cell_array 0x1 0 cell
which might be useful in a loop, in which you may concatenate a column cell array but not a row cell array
>> cell_array = cat( 1, cell_array, {'a';'b'} )
cell_array =
'a'
'b'
>> cell_array = cell([], 1);
>> cell_array = cat( 1, cell_array, {'a','b'} )
Error using cat
Dimensions of matrices being concatenated are not consistent.
Equivalent to cell_array = cell(0,1);

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