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MathGroup Archive 2005

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Re: Writing result of "Do" in a single List

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55350] Re: [mg55305] Writing result of "Do" in a single List
  • From: "David Annetts" <davidannetts at aapt.net.au>
  • Date: Sat, 19 Mar 2005 04:47:17 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Laurent,

> When I am calculating values with the
> Do[expr, {i, imin, imax, di}]
> expression, I get single values as a result that are a pain to export.
> How can I write these values in a list that then can easily 
> be exported?

Why not re-cast the calculation so that it produces a table?  Tables can be
exported (using Export).  For example

ival = Range[imin, imax, idel];
tbl = expr[#]& /@ ival;
Export["filename", tbl, "Lines"];

or

ival = Range[imin, imax, idel];
tbl = {#, expr[#]}& /@ ival;
Export["filename.dat", tbl];

An alternative, depending on the complexity "expr", is to write to a file as
you go through the loop.  An example of this might be

outf = OpenWite["filename", PageWidth->Infinity];
Do[
	expr;
	Write[outf, expr],
	{i, imin, imax, idel}
	];

The first option is usually preferred since functional programming is
usually much quicker & easier to read than the Do loop.

Regards,

Dave.


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