bitget

Bit at specified position

Syntax

C = bitget(A, bit)

Description

C = bitget(A, bit) returns the value of the bit at position bit in A. Operand A must be an unsigned integer, a double, or an array containing unsigned integers, doubles or both. The bit input must be a number between 1 and the number of bits in the unsigned integer class of A (e.g., 32 for the uint32 class).

The output of bitget is independent of the endian settings of the computer you are using.

Examples

Example 1 — Binary Conversion

The dec2bin function converts decimal numbers to binary. However, you can also use the bitget function to show the binary representation of a decimal number. Just test successive bits from most to least significant:

disp(dec2bin(13))  1101    C = bitget(uint8(13), 4:-1:1)  C =       1     1     0     1

Example 2 — Binary Compare

Prove that intmax sets all the bits to 1:

a = intmax('uint8');  if all(bitget(a, 1:8))     disp('All the bits have value 1.')     end    All the bits have value 1.

Example 3 — Vector and Array Operations

Get the value of the second most significant bit of the number sequence 5 through 75, counting by tens:

bitget(5:10:75, [2 3 4 5 5 5 6 7])  ans =       0     1     1     0     0     1     0     1

Do the same, but using 2-by-4 matrices:

bitget([5 15 25 35; 45 55 65 75], ...         [2 3 4 5; 5 5 6 7])  ans =       0     1     1     0       0     1     0     1  

bitand, bitcmp, bitmax, bitor, bitset,bitshift,bitxor

dec2bin(23)  ans =      10111