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MathGroup Archive 1999

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Re: Slow Import version 4

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18106] Re: Slow Import version 4
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 17 Jun 1999 12:26:41 -0400
  • Organization: Universitaet Leipzig
  • References: <7k4osl$co5@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Mark,

I have no Windows here but is it so slow also in a second call ?
I think the Import/Export is done by MathLink programs. The program
must be called for the first evaluation. The second call will not
search the harddisk and start the program again.

Regards
  Jens


Mark Fisher wrote:
> 
> I am puzzled by the slowness of Importing a "Table" of data in Version
> 4.
> 
> Export["mat.dat", Table[Random[], {100},{100}]
> Timing[Import["mat.dat"];]
> Timing[ReadList["mat.dat", Number, RecordLists->True];]
> 
> The Timing for Import is 43.89 Second, while for ReadList it's only 0.71
> Second. Any ideas as to what's going on here? (BTW, I'm using Win98.)
> 
> --Mark.


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