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How can I create a cell array by combining arrays?

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Billie Jean
Billie Jean on 12 Nov 2016
Edited: Jan on 14 Nov 2016
Lets say;
names=['X1','X2','X3']
first=[1 2 3]
second=[4 5 6]
third=[7 8 9]
I need a cell array that is combination of these four arrays. It should be 1x4!
cellArray={['X','Y','Z'],[1 2 3],[4 5 6],[7 8 9]}
How can I write that code. horzcat is no good. Thanks!

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Jan
Jan on 14 Nov 2016
Note that
names=['X1','X2','X3']
is the same as
names='X1X2X3'
Therefore I cannot guess, what you want as output and how your input exactly should look like.

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Answers (2)

Ahmet Cecen
Ahmet Cecen on 12 Nov 2016
Edited: Ahmet Cecen on 12 Nov 2016
maybe this? mat2cell
it is unclear what you are trying to accomplish with the cell conversion, so this is the best I can do.

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George
George on 12 Nov 2016
What are you having trouble with? The code you posted works.
>> cellArray={['X','Y','Z'],[1 2 3],[4 5 6],[7 8 9]}
cellArray =
1×4 cell array
'XYZ' [1×3 double] [1×3 double] [1×3 double]
>>

  3 Comments

Ahmet Cecen
Ahmet Cecen on 14 Nov 2016
Oooh, string arrays are uncomfortable in MATLAB. Either do {'X','Y','Z'} or make a table() instead of a cell array.
['X','Y','Z'] is the concatenate constructor for strings, not an array.
Image Analyst
Image Analyst on 14 Nov 2016
Billie Jean, please read the FAQ on cell arrays. I think it will help you understand. http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F
With ['X','Y','Z'] you are concetnating 3 single characters to form a 1-by-3 character array, also known as a string. They are the same thing. In fact you can also set it to 'XYZ' and get the same thing. Just look:
>> s=['X','Y','Z']
s =
XYZ
>> whos s
Name Size Bytes Class Attributes
s 1x3 6 char
>> s='XYZ'
s =
XYZ
>> whos s
Name Size Bytes Class Attributes
s 1x3 6 char
Now, that string is inside the first cell of a 1-by-4 cell array. A single cell, like the first one , is a 1-by-1 array if you want to look at it that way. But because it's a cell, it can contain virtually anything inside it. And in this case, that first cell contains a 1x3 string (character array) inside it. Think of a cell like a bucket, and a cell array as an array of buckets. You can throw anything you want into the buckets: a string, a double array, a structure, a table, even another cell or cell array. Different buckets can contain anything - you're not required to have a whole column or whole row have the same data type in it. You can vary the contents of the buckets on a bucket-by-bucket basis. Again, read the FAQ - you won't regret it.

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