MATLAB Data Types D 2345
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MATLAB - DATA TYPES http://www.tutorialspoint.com/matlab/matlab_data_types.htm Copyright © tutorialspoint.com MATLAB does not require any type declaration or dimension statements. Whenever MATLAB encounters a new variable name, it creates the variable and allocates appropriate memory space. If the variable already exists, then MATLAB replaces the original content with new content and allocates new storage space, where necessary. For example, Total = 42 The above statement creates a 1-by-1 matrix named 'Total' and stores the value 42 in it. Data Types Available in MATLAB MATLAB provides 15 fundamental data types. Every data type stores data that is in the form of a matrix or array. The size of this matrix or array is a minimum of 0-by-0 and this can grow up to a matrix or array of any size. The following table shows the most commonly used data types in MATLAB − Data Type Description int8 8-bit signed integer uint8 8-bit unsigned integer int16 16-bit signed integer uint16 16-bit unsigned integer int32 32-bit signed integer uint32 32-bit unsigned integer int64 64-bit signed integer uint64 64-bit unsigned integer single single precision numerical data double double precision numerical data logical logical values of 1 or 0, represent true and false respectively char character data stringsarestoredasvectorofcharacters cell array array of indexed cells, each capable of storing an array of a different dimension and data type structure C-like structures, each structure having named fields capable of storing an array of a different dimension and data type function handle pointer to a function user classes objects constructed from a user-defined class java classes objects constructed from a Java class Example Create a script file with the following code − str = 'Hello World!' n = 2345 d = double(n) un = uint32(789.50) rn = 5678.92347 c = int32(rn) When the above code is compiled and executed, it produces the following result − str = Hello World! n = 2345 d = 2345 un = 790 rn = 5678.9 c = 5679 Data Type Conversion MATLAB provides various functions for converting, a value from one data type to another. The following table shows the data type conversion functions − Function Purpose char Convert to character array string int2str Convert integer data to string mat2str Convert matrix to string num2str Convert number to string str2double Convert string to double-precision value str2num Convert string to number native2unicode Convert numeric bytes to Unicode characters unicode2native Convert Unicode characters to numeric bytes base2dec Convert base N number string to decimal number bin2dec Convert binary number string to decimal number dec2base Convert decimal to base N number in string dec2bin Convert decimal to binary number in string dec2hex Convert decimal to hexadecimal number in string hex2dec Convert hexadecimal number string to decimal number hex2num Convert hexadecimal number string to double-precision number num2hex Convert singles and doubles to IEEE hexadecimal strings cell2mat Convert cell array to numeric array cell2struct Convert cell array to structure array cellstr Create cell array of strings from character array mat2cell Convert array to cell array with potentially different sized cells num2cell Convert array to cell array with consistently sized cells struct2cell Convert structure to cell array Determination of Data Types MATLAB provides various functions for identifying data type of a variable. Following table provides the functions for determining the data type of a variable − Function Purpose is Detect state isa Determine if input is object of specified class iscell Determine whether input is cell array iscellstr Determine whether input is cell array of strings ischar Determine whether item is character array isfield Determine whether input is structure array field isfloat Determine if input is floating-point array ishghandle True for Handle Graphics object handles isinteger Determine if input is integer array isjava Determine if input is Java object islogical Determine if input is logical array isnumeric Determine if input is numeric array isobject Determine if input is MATLAB object isreal Check if input is real array isscalar Determine whether input is scalar isstr Determine whether input is character array isstruct Determine whether input is structure array isvector Determine whether input is vector class Determine class of object validateattributes Check validity of array whos List variables in workspace, with sizes and types Example Create a script file with the following code − x = 3 isinteger(x) isfloat(x) isvector(x) isscalar(x) isnumeric(x) x = 23.54 isinteger(x) isfloat(x) isvector(x) isscalar(x) isnumeric(x) x = [1 2 3] isinteger(x) isfloat(x) isvector(x) isscalar(x) x = 'Hello' isinteger(x) isfloat(x) isvector(x) isscalar(x) isnumeric(x) When you run the file, it produces the following result − x = ans ans ans ans ans x = ans ans ans ans ans x = 3 = 0 = 1 = 1 = 1 = 1 1177/50 = 0 = 1 = 1 = 1 = 1 1 ans ans ans ans x = ans ans ans ans ans = 0 = 1 = 1 = 0 Hello = 0 = 0 = 1 = 0 = 0 2 3 Loading [MathJax]/jax/output/HTML-CSS/fonts/TeX/fontdata.js
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