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MathGroup Archive 2000

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Saving Large Matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24773] Saving Large Matrices
  • From: bbongiorno at attglobal.net
  • Date: Thu, 10 Aug 2000 00:31:56 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

I need a effective way to store and retrieve a 300,000 x 44 matrix that
includes alpha numeric and numeric cells.

The data is first downloaded from a database into a mathematica variable
in a note book. Included in some of the alpha numeric cells are commas,
tabs and spaces and therefore I cannot use Write function. If I use the
Write function to store the matrix, the integrity of the shape of the
matrix is impaired.

The Export function  works but it takes 24 hours to store the matrix on
a Pentium II 300 with major virtual memory usage.



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