Basic Learning of MATLAB -------------- cellular array

Similar to the architecture array, the cellular array can store data of different types and sizes. Each element is called a cell ).

(1) create a cellular array

Three methods: direct assignment, using the cell () function and using {} to directly create all cells in the cellular array.

Instance:

% 1. Direct value assignment method % assign a value to a unit in the unit array through the value assignment statement. Only one unit content can be created at a time. % There are two Assignment Methods: content Indexing Method and unit indexing method % (1) Content Indexing Method: enclose the following table in braces on the left side of the assignment statement, and add the unit content % instance on the right side: create a 2*2 cellular array c {} = 'this is a cell array'; % string c {} = [, 5, 0]; % matrix C {2, 1} = []; c {2, 2} = 4 + 3 * I; % plural class (c) % determined data type % running result: % ans = % cell % C = % 'This is a cell array' [2x5 double] % [] [4.0000 + 3.20. I] % (2) unit index method: Use () on the left of the value assignment statement to enclose the following table of units. The content of the Unit on the right is {} %: create a 2*2 cellular array C () = {'this is a cell array'}; % string C () = {[, 5; 6, 7, 0]}; % matrix C () = {[]}; C () = {4 + 3 * I }; % plural % same running result % 2. Cell () function creation method % cell () function can create a cell array, and you can also specify the size % Syntax: cell_array = cell (m, n) Create a cellular array of M * n, after definition, you can assign a value to it by using the value assignment method. 3. Use {} to directly create a cellular array. % to list the contents of the expected cellular array in sequence in braces. Separate them with commas, separate rows with semicolons. % instance: Create a 2*3 cell array cell = {['eas', 'is ', s', 'cellarray'], [1, 2], []; 2 + 3 * I, 4, eye (4)} class (cell) % running result: % cell = % 'thisscellarray' [1x2 double] [] % [2.0000 + 3.20. I] [4] [4x4 double] % ans = % cell

(2) access to the cellular array

There are two ways to access the % object array: % (1) enclose the subscript with () to access the structure type of the unit % (2) use {} to enclose the subscript and access the specific content of the unit. % compile the example based on the cell cellular array: Cella = cell) A = cell {1, 1} B = cell (1, 2) B = cell {2.0000} % running result % cell = % 'thisscellarray' [1x2 double] [] % [+ 3.20. I] [4] [4x4 double] % A = % 'thisscellarray' % A = % thisscellarray % B = % [1x2 double] % B = % 1 2% use celldisp () the function accesses all cell content in the cellular array. The result is: % cell {2.0000} = % thisisscellarray % cell {2%} = % 4% + 3.20. I % cell {} = % 1 cell {} = % cell {1, 3} = % [] % cell {2, 3 }=% 1 0 0 0% 0 1 0 0% 0 1 0% 0 0 0 1

(3) basic operations on the cellular array

Including access to the cellular array, extension, reduction, nesting, and other operations of the cellular array

% 1. The extension % of the cellular array extended instance cellcell {3, 2} = ['this is the extended content'] % automatically extended to 3*3 arrays, the unassigned part is [] % running result: % cell = % 'thisscellarray' [1x2 double] [] % [2.0000 + 3.20. I] [4] [4x4 double] % cell = % 'thisscellarray '[1x2 double] [] % [2.0000 + 3.20. I] [4] [4x4 double] % [] 'This is the extended content' [] % 2.% of the metacell array through delete the row or column % syntax of the array by assigning null values to the Unit to be deleted: % (1) Delete row: cellname (row number, :) = [] % (1) delete column: cellname (:, column number) = [] % instance cell (2, :) = [] % Delete cell (:, 1) = [] % Delete first column % result: % cell = % 'Thisscellarray' [1x2 double] [] % [] 'This is the extended content' [] % cell = % [1x2 double] [] % 'This is the extended content '[] % 3. The nested cellular array % The cellular array contains other cellular numbers, the meta-cell array is called the nested meta-cell array, and the meta-cell without the nested structure is called the page meta-cell. % Nested cell arrays can be created using nested braces or cell functions, or directly using value assignment expressions, % You can also access the child array, Meta cell, or meta cell element of the nested meta cell array. % Instance A = cell (); A {} = 12; A {} = []; % cellular array nesting A {} = 'cellular array nesting '; A {} = [, 3;, 6] cellplot () % plot the structure of the cell array % Result: % A = % [12] {1x1 cell} % 'nested cellular array' [2x3 double]

(4) operation functions of the cellular array

Celldisp () displays the CONTENT OF THE CELL ARRAY

Cellplot () plot the STRUCTURE OF THE CELL ARRAY

% Reshape () changes the shape of the cellular array reshape (A,) % based on the above example, the cellular array a is changed from 2*2 to 1*4%. Result: % ans = % [12] 'cell array nesting '{1x1 cell} [2x3 double] % cell2struct () convert the cell array to the schema array % num2cell () convert the Number Matrix to the cellular array num = [, 3;, 6]; cell_num = num2cell (Num) % digital matrix to the cellular array class (cell_num) % determine type iscell (cell_num) % determine whether it is a cellular array % run result: % cell_num = % [1] [2] [3] % [4] [5] [6] % ans = % cell % ans = 1% cellstr () convert a two-dimensional character array to a string unit array S = ['abc'; 'defg'; 'Hi']; C = cellstr (s) % result % C = % 'abc' % 'defg' % 'Hi' % class (c) % ans = % cell % char () converts a string cell array to a character array.

Basic Learning of MATLAB -------------- cellular array