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For Loop problem

  • To: mathgroup at
  • Subject: [mg65595] For Loop problem
  • From: Rob <rob at>
  • Date: Mon, 10 Apr 2006 02:31:15 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

I've got to manipulate some signed 12bit integer numbers from a file and
apparently Mathematica only handles 8 and 16 bit signed numbers
(probably for a very good reason). So I bring them in as 16 bits (and
they're stored that way with a leading zero nibble) and then I have to
do the following to make sense of them.  I really don't know why this
code works but it does.

For[i = 1, i < Length[y], i++, If[y[[i]] > 2048, y[[i]] =
     y[[i]] - 2048, y[[i]] = y[[i]] + 2048]];

So to my question: once again I had to resort to a For loop to pull this
off and I know this is a no-no.  But I'm so clueless about Mathematica
that I've never come up with a more sophisticated method after a year or
so of thinking about it. Can someone help (as they usually can)?

Thanks, Rob

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