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MathGroup Archive 2007

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Re: How can a dump file with 1.28MB have nothing in it?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72556] Re: How can a dump file with 1.28MB have nothing in it?
  • From: "doesitinmud" <harderm at onid.orst.edu>
  • Date: Mon, 8 Jan 2007 04:52:31 -0500 (EST)
  • References: <em8jph$pnn$1@smc.vnet.net><emo7sm$fue$1@smc.vnet.net>

David, et al.,
   I think the answer to my own question is that even an empty dump
file will contain >1MB.  What probably happened was that I attempted to
save to the dump file from a notebook with an empty or no kernel.  I
use dump files because I'm doing what might be called exploratory data
analysis.  The methods I developed seem to be like no others in the
statistics and chemometrics packages I know of.  Since these methods
are new, they can't be encapsulated in a program.  Perhaps a package of
functions would help somewhat, but I still have long, experimental
sessions in which the data are transformed and manipulated in all
manner of ways to find an acceptable problem solution. The problem is
not so much procedures that number crunch for a long time, although
that happens sometimes, but an evolving process in which it is most
convenient to keep intermediate results of all sorts available in the
kernel for examination and re-use.  Hence the use of Dump files to
store a snapshot of data and variables in process.  As long as I'm
working this way, I need to be more disciplined about saving final
results and frequently "backing up" via DumpSave.  Also, I am now
DumpSaving to 2 different file names per session.  If you have any
ideas for a better strategy to do my kinds of problems, I would be glad
to hear them.  Thanks for the response so far.




On Dec 25 2006, 2:07 am, David Bailey <dave at Remove_Thisdbailey.co.uk>
wrote:
> doesitinmud wrote:
> >   I have been saving my intermediate results to adumpfileduring the
> > course of a very large notebook (~10MB, ~800 lines).  I decided to
> > begin a new notebook, and begin it by opening thedumpfile.  When I
> > started a new notebook and loaded thedumpfile, I could no longer find
> > any of the symbol definitions saved from the old notebook.  How did
> > this happen?  How can I retrieve the information in thedumpfile?How can anyone answer this question - as you have supplied no code! I
> must say, however, I would not store important results in binary format
> - it probably takes up less disk space, but if something goes wrong, you
> have nothing. If you ARE going to use DumpSave, I would at least check
> that it is working as you expect early on in the process.
>
> Are you performing a calculation that takes an excessively long time to
> run, and if so, are you sure this could not be speeded up in some way so
> that there is no need to do the calculation in several stages.
>
> If you supply more details of your problem, I am sure someone here will
> be able to help - although probably not to salvage your previous results!
> 
> David Baileyhttp://www.dbaileyconsultancy.co.uk


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