int64

64-bit signed integer arrays

Description

Variables in MATLAB^® of data type (class) int64 are stored as 8-byte (64-bit) signed integers. For example:

y = int64(10);
whos y

  Name      Size            Bytes  Class    Attributes

  y         1x1                 8  int64                    

For more information on integer types, see Integers.

Creation

Some array creation functions allow you to specify the data type. For instance, zeros(100,'int64') creates a 100-by-100 matrix of zeros of type int64.

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 int64 by using the int64 function.

Syntax

Y = int64(X)

Description

Y = int64(X) converts the values in X to type int64. Values outside the range [-2⁶³,2⁶³-1] map to the nearest endpoint.

Input Arguments

X — Input array

scalar | vector | matrix | multidimensional array

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

Data Types: double | single | int8 | int16 | int32 | uint8 | uint16 | uint32 | uint64 | logical | char

Examples

Convert to 64-Bit Signed Integer Variable

Convert a double-precision variable to a 64-bit signed integer.

x = 100;
xtype = class(x)

xtype = 
'double'

y = int64(x)

y = int64
    100

Extended Capabilities

Tall Arrays

Calculate with arrays that have more rows than fit in memory.

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

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

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

GPU Arrays

Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.

This function fully supports GPU arrays. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Distributed Arrays

Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).