Hexadecimal and Binary Values
You can represent numbers as hexadecimal or binary values. In some contexts, these representations
of numbers are more convenient. For example, you can represent the bits of a hardware register
using binary values. In MATLAB®, there are two ways to represent hexadecimal and binary values:
• As literals. Starting in R2019b, you can write hexadecimal and binary values as literals using an
appropriate prefix as notation. For example, 0x2A is a literal that specifies 42—and MATLAB
stores it as a number, not as text.
• As strings or character vectors. For example, the character vector '2A' represents the number 42
as a hexadecimal value. When you represent a hexadecimal or binary value using text, enclose it
in quotation marks. MATLAB stores this representation as text, not a number.
MATLAB provides several functions for converting numbers to and from their hexadecimal and binary
representations.
Write Integers Using Hexadecimal and Binary Notation
Hexadecimal literals start with a 0x or 0X prefix, while binary literals start with a 0b or 0B prefix.
MATLAB stores the number written with this notation as an integer. For example, these two literals
both represent the integer 42.
A = 0x2A
A = uint8
42
B = 0b101010
B = uint8
42
Do not use quotation marks when you write a number using this notation. Use 0-9, A-F, and a-f to
represent hexadecimal digits. Use 0 and 1 to represent binary digits.
By default, MATLAB stores the number as the smallest unsigned integer type that can accommodate
it. However, you can use an optional suffix to specify the type of integer that stores the value.
• To specify unsigned 8-, 16-, 32-, and 64-bit integer types, use the suffixes u8, u16, u32, and u64.
• To specify signed 8-, 16-, 32-, and 64-bit integer types, use the suffixes s8, s16, s32, and s64.
For example, write a hexadecimal literal to be stored as a signed 32-bit integer.
A = 0x2As32
A = int32
42
When you specify signed integer types, you can write literals that represent negative numbers.
Represent negative numbers in two's complement form. For example, specify a negative number with
a literal using the s8 suffix.
A = 0xFFs8
A = int8
-1
Hexadecimal and Binary Values
6-55
You can represent numbers as hexadecimal or binary values. In some contexts, these representations
of numbers are more convenient. For example, you can represent the bits of a hardware register
using binary values. In MATLAB®, there are two ways to represent hexadecimal and binary values:
• As literals. Starting in R2019b, you can write hexadecimal and binary values as literals using an
appropriate prefix as notation. For example, 0x2A is a literal that specifies 42—and MATLAB
stores it as a number, not as text.
• As strings or character vectors. For example, the character vector '2A' represents the number 42
as a hexadecimal value. When you represent a hexadecimal or binary value using text, enclose it
in quotation marks. MATLAB stores this representation as text, not a number.
MATLAB provides several functions for converting numbers to and from their hexadecimal and binary
representations.
Write Integers Using Hexadecimal and Binary Notation
Hexadecimal literals start with a 0x or 0X prefix, while binary literals start with a 0b or 0B prefix.
MATLAB stores the number written with this notation as an integer. For example, these two literals
both represent the integer 42.
A = 0x2A
A = uint8
42
B = 0b101010
B = uint8
42
Do not use quotation marks when you write a number using this notation. Use 0-9, A-F, and a-f to
represent hexadecimal digits. Use 0 and 1 to represent binary digits.
By default, MATLAB stores the number as the smallest unsigned integer type that can accommodate
it. However, you can use an optional suffix to specify the type of integer that stores the value.
• To specify unsigned 8-, 16-, 32-, and 64-bit integer types, use the suffixes u8, u16, u32, and u64.
• To specify signed 8-, 16-, 32-, and 64-bit integer types, use the suffixes s8, s16, s32, and s64.
For example, write a hexadecimal literal to be stored as a signed 32-bit integer.
A = 0x2As32
A = int32
42
When you specify signed integer types, you can write literals that represent negative numbers.
Represent negative numbers in two's complement form. For example, specify a negative number with
a literal using the s8 suffix.
A = 0xFFs8
A = int8
-1
Hexadecimal and Binary Values
6-55