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MathGroup Archive 2006

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Re: Formatted Output (Exporting Data)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64429] Re: [mg64415] Formatted Output (Exporting Data)
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 17 Feb 2006 04:11:36 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

f[x_]:=x^2;

t=Table[{x,f[x]},{x,-1,1,1/5}]/.
      x_Rational:>N[x,6];

Export["foo.d",t,"TSV"];


Bob Hanlon

> 
> From: "tlhiv" <thenders at gmail.com>
To: mathgroup at smc.vnet.net
> Subject: [mg64429] [mg64415] Formatted Output (Exporting Data)
> 
> 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
> 
> 

Bob Hanlon
Chantilly, VA


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