Append to a file?
- To: mathgroup at smc.vnet.net
- Subject: [mg47522] Append to a file?
- From: Nathan Moore <nmoore at physics.umn.edu>
- Date: Thu, 15 Apr 2004 03:39:34 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
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