MATLAB Data Types

MATLAB Data Types

1.Numeric Types:

This section covers the following topics:

Integers, Floating-Point Numbers, Complex Numbers, Infinity and NaN, Identifying Numeric Types, Display Format for Numeric Values ,Function Summary.

Integers:

MATLAB has four signed and four unsigned integer data types.

Creating Integer Data:

Name Size Bytes Class

x 1x1 2 int16 array

Or you can use the class function if you want to assign the output as shown here: xType = class(x)

xType =

int16

Use the isinteger function if you just want to verify that x is an integer: isinteger(x)

ans =

: str = 'Hello World';

int8(str)

ans =

72 101 108 108 111 32 87 111 114 108 100

Floating-Point Numbers:

Double-Precision Floating Point

Single-Precision Floating Point

Creating Double-Precision Data:

Name Size Bytes Class

x 1x1 8 double array

Creating Single-Precision Data:

Name Size Bytes Class

x 1x1 4 single array

2.Logical Types:

The logical data type represents a logical true or false state using the numbers 1 and 0, respectively. Certain

For example, the statement (5 * 10) > 40 returns a logical true value.

Creating a Logical Array:

One way of creating an array of logicals is to just enter a true or false value for each element. The true function returns logical one; the false function returns logical zero:

x = [true, true, false, true, false];

3.Characters and Strings:

This section covers:

Creating Character Arrays:

name = 'Thomas R. Lee';

Name Size Bytes Class

name 1x13 26 char array

name = 'Thomas R. Lee';

title = ' Sr. Developer';

strcat(name,',',title)

ans =

Thomas R. Lee, Sr. Developer

Cell Arrays of Strings:

Converting to a Cell Array of Strings:

data = ['Allison Jones';'Development ';'Phoenix '];

celldata = cellstr(data)

celldata =

'Allison Jones'

'Development'

'Phoenix’

length(celldata{3})

ans =

String Comparisons:

str1 = 'hello';

str2 = 'help';

C = strcmp(str1,str2)

C =

C = strncmp(str1, str2, 2)

C =

Converting from Numeric to String:

x = [77 65 84 76 65 66];

char(x)

ans =

MATLAB

Converting from String to Numeric:

name = 'Thomas R. Lee';

name = double(name)

name =

84 104 111 109 97 115 32 82 46 32 76 101 101

4.Dates and Times:

Current Date and Time:

date

ans =

02-Oct-1996

datestr(now)

ans =

02-Oct-1996 16:56:16

datestr(floor(now))

ans =

02-Oct-1996

5.Structures:

Building Structure Arrays:

patient.name = 'John Doe';

patient.billing = 127.00;

patient.test = [79 75 73; 180 178 177.5; 220 210 205];

Now entering patient

at the command line results in name: 'John Doe'

billing: 127

test: [3x3 double]

Accessing Data in Structure Arrays:

mypatients(1)

ans =

name: 'John Doe'

billing: 127

6.Cell Arrays:

Creating Cell Arrays:

A(1,1) = {[1 4 3; 0 5 8; 7 2 9]};

A(1,2) = {'Anne Smith'};

A(2,1) = {3+7i};

A(2,2) = {-pi:pi/10:pi};

C = {[1 2], [3 4]; [5 6], [7 8]};

7.Function Handles:

Constructing and Invoking a Function Handle:

fhandle = @functionname

Calling a Function Using Its Handle

fhandle(arg1, arg2, ..., argn)

fhandle()

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