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Re: Is it possible to create a single csv file one row at

  • To: mathgroup at smc.vnet.net
  • Subject: [mg103548] Re: [mg103532] Is it possible to create a single csv file one row at
  • From: Herman Kuun <oomkoos1 at gmail.com>
  • Date: Sun, 27 Sep 2009 23:05:25 -0400 (EDT)
  • References: <200909271130.HAA04960@smc.vnet.net>

Richard one method is

   outFile  =   OpenAppend[ "filename" ]

     Write[ expression ]

     Close[ outFile ]

Best

On Sun, Sep 27, 2009 at 1:30 PM, Phineas Q. Butterfats <
phineas.q.butterfats at gmail.com> wrote:

> Hi!
>
> I'm running an algorithm that outputs a list of numbers each time it
> runs.  I need to collect this data so I can analyze it in Mathematica,
> but I have to run my algorithm about 14 million times.  So far I've
> been creating tables with 100,000 rows (one for each run of the
> algorithm) and then exporting them to csv files.  My question is:  can
> I create a csv file one row at a time?  Is there a way to use Export
> (or something else) so that the file isn't overwritten each time I run
> my algorithm, but instead builds a single csv file row by row?  It's
> less taxing on my system if I can create the csv file "on the fly," as
> opposed to creating such big tables first, and then exporting them.
> Of course, I could just have 14 million csv files, each with one row,
> but I'd prefer to group them 100,000 at a time to begin with.
>
> Any help is greatly appreciated, thank you so much!
>
>


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