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MathGroup Archive 2000

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Re: Rounding Numbers in for output in GridBox

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25134] Re: [mg25086] Rounding Numbers in for output in GridBox
  • From: BobHanlon at aol.com
  • Date: Sun, 10 Sep 2000 03:14:52 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 9/7/2000 11:06:02 PM, JOHN_C_ERB at prodigy.net writes:

>I would like to make a nice table for printing.
>The table contains strings and numbers.
>I would like to have the numbers rounded (or formatted)
>to display to a specified number of digits or decimal points.
>
>The routine below is an attempt at rounding the numbers to two
>decimal places for output in table form using "GridBox."
>
>The problem is that the numbers are displayed to 15 decimal places,
>after they have been rounded.
>
>Any suggestions on displaying a specified number of digits or
>decimal points?
>
>I am using Mathematica 4.0.1 and Windows 98, 2nd Ed.
>

genRound[x_, incr_:1] := incr*Round[x/incr];

nbrForm[x_, n_:2] := 
  NumberForm[x, {n + Ceiling[Log[10, x]], n}, NumberPadding -> {"", "0"}];

TableForm[Table[{
      x = 100*Random[], 
      genRound[x, 0.01] // nbrForm, 
      nbrForm[genRound[x, 0.25]], 
      nbrForm[genRound[x, 0.1], 1], 
      genRound[x], 
      genRound[x, 5]}, 
    {20}] , 
  TableAlignments -> Right, 
  TableHeadings -> {None, {"x", "{x, 0.01}", "{x, 0.25}", 
"{x, 0.1}", "{x, 1}", "{x, 5}"}}]


Bob Hanlon


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