bitandreduce

Reduce consecutive slice of bits to one bit by performing bitwise AND operation

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Syntax

c = bitandreduce(a)
c = bitandreduce(a, lidx)
c = bitandreduce(a, lidx, ridx)

Description

example

c = bitandreduce(a) performs a bitwise AND operation on the entire set of bits in the fixed-point input, a, and returns the result as an unsigned integer of word length 1.

example

c = bitandreduce(a, lidx) performs a bitwise AND operation on a consecutive range of bits, starting at position lidx and ending at the LSB (the bit at position 1).

example

c = bitandreduce(a, lidx, ridx) performs a bitwise AND operation on a consecutive range of bits, starting at position lidx and ending at position ridx.

The bitandreduce arguments must satisfy the following condition:

a.WordLength >= lidx >= ridx >= 1

Examples

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Open Live Script

Create a fixed-point number.

a = fi(73,0,8,0);
disp(bin(a))
01001001

Perform a bitwise AND operation on the entire set of bits in a.

c = bitandreduce(a)
c = 
     0

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 1
        FractionLength: 0

Because the bits of a do not all have a value of 1, the output has a value of 0.

Open Live Script

Create a fixed-point vector.

a = fi([12, 4, 8, 15],0,8,0);
disp(bin(a))
00001100   00000100   00001000   00001111

Perform a bitwise AND operation on the bits of each element of a, starting at position fi(4).

c = bitandreduce(a, fi(4))
c=1×4 object
     0     0     0     1

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 1
        FractionLength: 0

The only element in output c with a value of 1 is the 4th element. This is because it is the only element of a that had only 1's between positions fi(4) and 1.

Open Live Script

Create a fixed-point matrix.

a = fi([7, 8, 1; 5, 9, 5; 8, 37, 2], 0, 8, 0);
disp(bin(a))
00000111   00001000   00000001
00000101   00001001   00000101
00001000   00100101   00000010

Perform a bitwise AND operation on the bits of each element of matrix a beginning at position 3 and ending at position 1.

c = bitandreduce(a, 3, 1)
c=3×3 object
     1     0     0
     0     0     0
     0     0     0

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 1
        FractionLength: 0

There is only one element in output c with a value of 1. This condition occurs because the corresponding element in a is the only element with only 1's between positions 3 and 1.

Input Arguments

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

bitandreduce supports both signed and unsigned inputs with arbitrary scaling. The sign and scaling properties do not affect the result type and value. bitandreduce performs the operation on a two's complement bit representation of the stored integer.

Data Types: fixed-point fi

Start position of range specified as a scalar of built-in type. lidx represents the position in the range closest to the MSB.

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

End position of range specified as a scalar of built-in type. ridx represents the position in the range closest to the LSB (the bit at position 1).

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

Output Arguments

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Output array, specified as a scalar, vector, matrix, or multidimensional array of fixed-point fi objects. c is unsigned with word length 1.

Extended Capabilities

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

See Also

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Introduced in R2007b

Fixed-Point Designer Documentation

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