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8-bit signed integer arrays


Variables in MATLAB® of data type (class) int8 are stored as 1-byte (8-bit) signed integers. For example:

y = int8(10);
whos y
  Name      Size            Bytes  Class    Attributes

  y         1x1                 1  int8                 

For more information on integer types, see Integers.


Some array creation functions allow you to specify the data type. For instance, zeros(100,'int8') creates a 100-by-100 matrix of zeros of type int8.

If you have an array of a different type, such as double or single, then you can convert that array to an array of type int8 by using the int8 function.



Y = int8(X) converts the values in X to type int8. Values outside the range [-27,27-1] map to the nearest endpoint.

Input Arguments

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

Data Types: double | single | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char


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

x = 100;
xtype = class(x)
xtype = 
y = int8(x)
y = int8

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

GPU Code Generation
Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.

Version History

Introduced before R2006a