uint8 - 8-bit unsigned integer arrays - MATLAB (original) (raw)

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8-bit unsigned integer arrays

Description

Variables in MATLAB® of data type (class) uint8 are stored as 1-byte (8-bit) unsigned integers. For example:

Name Size Bytes Class Attributes

y 1x1 1 uint8

For more information on integer types, see Integers.

Creation

Some array creation functions allow you to specify the data type. For instance,zeros(100,'uint8') creates a 100-by-100 matrix of zeros of typeuint8.

If you have an array of a different type, such as double orsingle, then you can convert that array to an array of typeuint8 by using the uint8 function.

Syntax

Description

Y = uint8([X](#d126e1938740)) converts the values inX to type uint8. Values outside the range [0,28-1] map to the nearest endpoint.

example

Input Arguments

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Input array, specified as a scalar, vector, matrix, or multidimensional array.

Data Types: double | single | int8 | int16 | int32 | int64 | uint16 | uint32 | uint64 | logical | char

Examples

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Convert a double-precision variable to an 8-bit unsigned integer.

x = 100; xtype = class(x)

Extended Capabilities

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Theuint8 function fully supports tall arrays. For more information, see Tall Arrays.

The uint8 function fully supports GPU arrays. To run the function on a GPU, specify the input data as a gpuArray (Parallel Computing Toolbox). For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Version History

Introduced before R2006a