= Cell Array Introduction =
Cell Arrays can contain differing information in every element. These types of arrays are useful when interacting with spreadsheet software.
== Creating Cell Arrays ==
Cell arrays follow the same conventions as regular arrays except instead of square brackets use curly brackets.
array = [1, 2, 3; 4, 5, 6];
cell_array = {1, 2, 3; 4, 5, 6};
Cell arrays have fewer limitations than regular arrays. The regular array can hold strings; however, the string in each element must be the same length. If one element in a regular array is a string then all elements must be a string. Cell arrays have neither of these limitations.
cell_array = {1, 2, 'a', 'abc'; rand(3, 2), magic(3), eye(3), 'junk'}
cell_array =
[ 1] [ 2] 'a' 'abc'
[3x2 double] [3x3 double] [3x3 double] 'junk'
With fewer limitations for the content of a cell array comes complications. While cell arrays are a powerful tool, these arrays work differently because each element can be almost anything.
== Dynamic Resizing ==
Cell arrays can be dynamically resized, which is a key feature in more advanced data structures. For example, a queue data structure using the commands:
cell_array{end+1}='a';
cell_array{end+1}='b';
An element can be popped from the front of the queue using the commands:
cell_array(1)=[]; % remove first element - resize
cell_array(1)=[]; % remove first element - resize
== Uses ==
=== GUI Tables ===
Cell arrays are used when displaying a table to a figure.
uitable('Data',{'hello',1;2,'there'})
== Converting to and from cell arrays ==
=== Converting From a Numeric Array into a Cell Array ===
Use num2cell to convert from a numeric into a cell array.
>> cell_array = num2cell(numeric_array);
=== Converting From a Cell Array into a Numeric Array ===
Use cell2mat to convert from a cell into a numeric array.
>> numeric_array = cell2mat(numeric_cell_array);
= External Links =
ControlTheoryPro.com