Re: Append to a file?
- To: mathgroup at smc.vnet.net
- Subject: [mg47571] Re: Append to a file?
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 16 Apr 2004 05:20:46 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <c5lfhs$brf$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
why not use PutAppend[] to save the temporay results,
read this file with Get[] when your calculation is finished
and export this ??
Regards
Jens
Nathan Moore wrote:
>
> Suppose I have a really difficult calculation that I perform - a nested
> sum,
>
> For[
> For[ something_really_hard,{i,0,20}],
> {j,0,50}
> ]
>
> where "something_really_hard" is a calculation that takes several
> minutes. Total execution time is going to be several hours, and I'd
> rather not have the calculation go most of the day and the fail at the
> last minute.
>
> Each execution of "something_really_hard" produces a vector of numbers
> as a result. I could of course store this vector as a list and then
> export it to file after the evaluation finishes, but I'd rather not
> risk losing that execution time.
>
> Is there an "Append-Export" command which I could use to append the
> state of my evaluation to the data file? The c programming corollary
> I'm thinking of is fflush()? I'm imagining Mathematica adding one line
> to the data file each time the inner for loop iterates.
>
> Nathan Moore
> University of Minnesota Physics