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MathGroup Archive 2007

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Re: Number of Differing Digits & Another Problem (want to see different ways it can be done)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76367] Re: Number of Differing Digits & Another Problem (want to see different ways it can be done)
  • From: osbornc at gmail.com
  • Date: Sun, 20 May 2007 02:37:47 -0400 (EDT)
  • References: <f2mf5b$mbm$1@smc.vnet.net>

On May 19, 4:14 am, VenDi... 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.

Hi,

If you have version 6.0, check out the function HammingDistance.

Chris



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