Re: Number of Differing Digits & Another Problem (want

*To*: mathgroup at smc.vnet.net*Subject*: [mg76331] Re: [mg76310] Number of Differing Digits & Another Problem (want*From*: Carl Woll <carlw at wolfram.com>*Date*: Sun, 20 May 2007 02:19:02 -0400 (EDT)*References*: <200705190845.EAA21281@smc.vnet.net>

VenDiddy at gmail.com wrote: >I just purchased a copy of Mathematica and I've been learning it for >about a week now. You can expect that I will be posting a lot of >questions. One thing I've noticed is that there are so many different >ways to do the same thing! > >Here is a function I came up with that calculates how many binary >digits two numbers differ in: > >BitDifferences[a_, b_, n_] := > Count[Equal @@@ > Thread[{IntegerDigits[a, 2, n], IntegerDigits[b, 2, n]}], True] > >For example 5 = 101 differs from 6 = 111 by one digit (the middle >digit). > >I want to see how you would do it so I can broaden my Mathematica >perspective. > >Thanks. > > > I would use BitXor and DigitCount as follows: bit2[a_, b_] := DigitCount[ BitXor[a, b], 2, 1] Carl Woll Wolfram Research

**References**:**Number of Differing Digits & Another Problem (want to see different ways it can be done)***From:*VenDiddy@gmail.com