Easy bit reversal

I need a function to reverse the bits of an int. I see I can flip bytes around, but that doesn't reverse the bit order. Any easy ideas? Thanks.

Answer 1

[Walter Roberson]

sum(uint32(bitset(0,1:32,bitget(uint32(X), 32:-1:1))))

(yes, there are other ways, some of them quite short but not necessarily efficient.)

[Oleg Komarov]

In the spirit of Cody: bin2dec(fliplr(dec2bin(10,32)))

Answer 2

[John F]

Nice guys. thanks.

Answer 3

[John F]

I frown upon looping in Matlab, but this worked for me:

for i = 1:WordLength
    h = bitshift(h,1) + bitand(x,1);
    x = bitshift(x,-1);
end

x = the original number
h = the bit reversed version of x

If you put a bit of code in front of it to determine the WordLength, it works quite well.