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

• To: mathgroup at smc.vnet.net
• Subject: [mg76310] Number of Differing Digits & Another Problem (want to see different ways it can be done)
• From: VenDiddy at gmail.com
• Date: Sat, 19 May 2007 04:45:08 -0400 (EDT)

```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.

```

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