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MathGroup Archive 2006

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Formatted Output (Exporting Data)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64415] Formatted Output (Exporting Data)
  • From: "tlhiv" <thenders at gmail.com>
  • Date: Thu, 16 Feb 2006 03:05:24 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

I'm trying to export the data obtained by evaluating a function at
certain points.  The method that I'm currently using is:

f[x_]:=x^2
Export["foo.d",Table[{x, f[x]}, {x, -1, 1, 0.2}], "Table"]

This generates a file "foo.d" that look like:

-1   1
-0.8   0.6400000000000001
-0.6   0.36
-0.39999999999999997   0.15999999999999998
-0.19999999999999996   0.03999999999999998
5.551115123125783e-17   3.0814879110195774e-33
0.20000000000000007   0.04000000000000003
0.4000000000000001   0.16000000000000006
0.6000000000000001   0.3600000000000001
0.8   0.6400000000000001
1.   1.

I would very much like to have "foo.d" look like:

-1 1
-0.8 0.64
-0.6 0.36
-0.4 0.16
-0.2 0.04
0 0
0.2 0.04
0.4 0.16
0.6 0.36
0.8 0.64
1 1

and with the delimeter being a TAB instead of a SPACE.  In particular,
the precision used above is not so good.  I would like everything
rounded off to, say, 6 significant digits.  An analogous C style output
would be something like

fprintf(fid,"%6f\t%6f\n,x,f)

and is performed for each "element" of x.  Can this be accomplished
easily with Mathematica?

Thanks,

Troy Henderson
Assistant Professor
Department of Mathematical Sciences
252 Thayer Hall
United States Military Academy
West Point, NY  10996
(845) 938-5649
http://www.tlhiv.org


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