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