Fixed-Point Toolbox™

bitget - Bit at certain position

Syntax

c = bitget(a, bit)

Description

c = bitget(a, bit) returns the value of the bit at position bit in a as a u1,0 (unsigned integer of word length 1). bit must be an integer between 1 and the word length of a, inclusive. If a has a signed numerictype, the bit representation of the stored integer is in two's complement representation.

bitget only supports fi objects with fixed-point data types. bitget does not support inputs with complex data types.

bitget supports variable indexing. This means that bit can be a variable instead of a constant.

a and bit can be vectors or scalars. a and bit must be the same size unless one is a scalar. If a is a vector and bit is a scalar, c is a vector of u1,0 values of the bits at position bit in each fi object in a. If a is a scalar and bit is a vector, c is a vector of u1,0 values of the bits in a at the positions specified in bit.

bit does not need to be a vector of sequential bit positions.

Examples

Example 1

This example shows how to get the binary representation of the bit at a specific position in a fi object. Consider the following unsigned fixed-point fi object with a value of 85, word length 8, and fraction length 0:

a = fi(85,0,8,0);
disp(bin(a))

01010101

Get the binary representation of the bit at position 4:

bit4 = bitget(a,4);
disp(bin(bit4))

0

Example 2

This example shows how to get the binary representation of the bits at a vector of positions in a fi object. Consider the following signed fixed-point fi object with a value of 55, word length 16, and best-precision fraction length 9:

a = fi(55);
disp(bin(a))

0110111000000000

Get the binary representation of the bits at positions 16, 14, 12, 10, 8, 6, 4, and 2: