bitor

Bit-wise OR

Syntax

C = bitor(A,B)

C = bitor(A,B,assumedtype)

objout = bitor(netobj1,netobj2)

Description

C = bitor(A,B) returns the bit-wise OR of A and B.

C = bitor(A,B,assumedtype) assumes that A and B are of assumedtype.

objout = bitor(netobj1,netobj2) returns the bit-wise OR of the .NET enumeration objects netobj1 and netobj2.

Examples

Truth Table

Create a truth table for the logical OR operation.

A = uint8([0 1; 0 1]);
B = uint8([0 0; 1 1]);
TTable = bitor(A, B)

TTable = 2x2 uint8 matrix

   0   1
   1   1

bitor returns 1 if either bit-wise input is 1.

Negative Values

MATLAB® encodes negative integers using two's complement. For example, to find the two's complement representation of -5, you take the bit pattern of the positive version of the number (00000101), swap each bit (11111010), and then add 1 to the result (11111011).

Therefore, the bit-wise OR of -5 (11111011) and 6 (00000110) is -1 (11111111).

a = -5;
bitget(a,8:-1:1,'int8')

ans = 1×8

     1     1     1     1     1     0     1     1

b = 6;
bitget(b,8:-1:1,'int8')

ans = 1×8

     0     0     0     0     0     1     1     0

c = bitor(a,b,'int8')

c = 
-1

bitget(c,8:-1:1,'int8')

ans = 1×8

     1     1     1     1     1     1     1     1

Combine Bytes into 32-bit Unsigned Integer

Use bitor and bitshift to pack four 8-bit bytes into the 32-bit integer they make up.

Create four bytes of data. Specify the data with hexadecimal literals, using the -u32 suffix to specify that the data should be stored as uint32. Each byte contains 8 bits worth of data.

byte4 = 0x87u32; 
byte3 = 0x65u32; 
byte2 = 0x43u32; 
byte1 = 0x21u32;

Start by adding the first byte as the first 8 bits of a 32-bit unsigned integer.

packedNum = byte1;

Next, pack the other three bytes into packedNum, using bitshift to shift the bytes to the proper locations, and bitor to copy the bits over.

packedNum = bitor(packedNum,bitshift(byte2,8));
packedNum = bitor(packedNum,bitshift(byte3,8*2));
packedNum = bitor(packedNum,bitshift(byte4,8*3));

View the packed 32-bit integer.

format hex
packedNum

packedNum = uint32
   87654321

Input Arguments

A,B — Input values

scalars | vectors | matrices | multidimensional arrays

Input values, specified as scalars, vectors, matrices, or multidimensional arrays. Inputs A and B must either be the same size or have sizes that are compatible (for example, A is an M-by-N matrix and B is a scalar or 1-by-N row vector). For more information, see Compatible Array Sizes for Basic Operations. A and B also must be the same data type unless one is a scalar double.

• If A and B are double arrays, and assumedtype is not specified, then MATLAB^® treats A and B as unsigned 64-bit integers.

• If assumedtype is specified, then all elements in A and B must have integer values within the range of assumedtype.

Data Types: double | logical | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

assumedtype — Assumed data type of integ1 and integ2

'uint64' | 'uint32' | 'uint16' | 'uint8' | 'int64' | 'int32' | 'int16' | 'int8'

Assumed data type of A and B, specified as 'uint64', 'uint32', 'uint16', 'uint8', 'int64', 'int32', 'int16', or 'int8'.

• If A and B are double arrays, then assumedtype can specify any valid integer type, but defaults to 'uint64'.

• If A and B are integer type arrays, then assumedtype must specify that same integer type.

Data Types: char | string

netobj1, netobj2 — Input values

.NET enumeration objects

Input values, specified as .NET enumeration objects. You must be running a version of Windows^® to use .NET enumeration objects as input arguments.

bitor is an instance method for MATLAB enumeration objects created from a .NET enumeration.

Output Arguments

C — Bit-wise OR result

array

Bit-wise OR result, returned as an array. C is the same data type as A and B.

• If either A or B is a scalar double, and the other is an integer type, then C is the integer type.

objout — Bit-wise OR result

.NET enumeration object

Bit-wise OR result, returned as a .NET enumeration objects.

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™.

HDL Code Generation
Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

GPU Arrays

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

The bitor function supports GPU array input with these usage notes and limitations:

• Both inputs can be unsigned integer arrays, or one input can be an unsigned integer array and the other input can be a scalar double.

• 64-bit integers are not supported.

• The assumedtype argument is not supported.

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™.

Usage notes and limitations:

• The assumedtype argument is not supported.

For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).

Version History

Introduced before R2006a