Easy bit reversal

2012 2 22
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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.

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Walter Roberson
Walter Roberson 2012-2-22

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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.)

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Oleg Komarov
Oleg Komarov 2012-2-22
In the spirit of Cody: bin2dec(fliplr(dec2bin(10,32)))

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John F
John F 2012-2-23

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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.

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