Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

bitset

Set bits at certain positions

Syntax

c = bitset(a, bit)
c = bitset(a, bit, v)

Description

example

c = bitset(a, bit) returns the value of a with position bit set to 1 (on).

example

c = bitset(a, bit, v) returns the value of a with position bit set to v.

Examples

collapse all

Begin with an unsigned fixed-point fi number with a value of 5, word length 4, and fraction length 0.

a = fi(5,0,4,0);
disp(bin(a))
0101

Set the bit at position 4 to 1 (on).

c = bitset(a,4);
disp(bin(c))
1101

Consider the following fixed-point vector with word length 4 and fraction length 0.

a = fi([0 1 8 2 4],0,4,0);
disp(bin(a))
0000   0001   1000   0010   0100

In each element of vector a, set the bits at position 2 to 1.

c = bitset(a,2,1);
disp(bin(c))
0010   0011   1010   0010   0110

Consider the following fixed-point scalar with a value of 5.

a = fi(5,0,4,0);
disp(bin(a))
0101

Set the bit at position fi(2) to 1.

c = bitset(a,fi(2),1);
disp(bin(c))
0111

Create a fi object with a value of pi.

a = fi(pi);
disp(bin(a))
0110010010001000

In this case, a is signed with a word length of 16.

Create a vector of the bit positions in a that you want to set to on. Then, get the binary representation of the resulting fi vector.

bit = fi([15,3,8,2]);
c = bitset(a,bit);
disp(bin(c))
0110010010001000   0110010010001100   0110010010001000   0110010010001010

Input Arguments

collapse all

Input array, specified as a scalar, vector, matrix, or multidimensional array of fixed-point fi objects. If a has a signed numerictype, the bit representation of the stored integer is in two's complement representation.

Data Types: fixed-point fi

Bit index, specified as a scalar, vector, matrix, or multidimensional array of fi objects or built-in data types. bit must be a number between 1 and the word length of a, inclusive. The LSB (right-most bit) is specified by bit index 1 and the MSB (left-most bit) is specified by the word length of a.

a = fi(pi,0,8);
a.bin
11001001

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

Bit value of a at index bit, specified as a scalar, vector, matrix, or multidimensional array of fi objects or built-in data types. v can have values of 0, or 1. Any value other than 0 is automatically set to 1. When v is nonscalar, it must have the same dimensions as one of the other inputs.

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

Output Arguments

collapse all

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

Extended Capabilities

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

See Also

| | | |

Introduced before R2006a

Was this topic helpful?