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MathGroup Archive 1992

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Re: Can Mathematica invert large complex arrays ( 700x700)?---in a timely way that is

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Re: Can Mathematica invert large complex arrays ( 700x700)?---in a timely way that is
  • From: mek at guinan.psu.edu (Mark E. Kotanchek)
  • Date: Fri, 15 May 92 08:15:27 EDT

In response to Gregory Lampshire's query,

   How good is Mme 2.0 on complex arrays that are about 700x700? 

   Would I expect to complete in a timely way on a NeXTstation with
   32 Mb of main memory?  By timely I mean within a half an hour?
   

I can't answer this; however, make SURE you don't have any symbols in  
your matrix or mma will attempt to invert the matrix SYMBOLICALLY--in  
which case you'll be waiting a lot longer. Since "symbols" include  
things like Pi I've found that when using mma for numerical stuff,  
its best to check the arrays (lists) and N[variables] before the  
critical steps. This results in several orders of maginitude in  
performance increase.

Mark.
---
Mark Kotanchek
Guidance & Control Dept - 363 ASB
Applied Research Lab/Penn State
P.O. Box 30
State College, PA 16804

e-mail:	mek at guinan.psu.edu (NeXTmail)
TEL:	(814)863-0682
FAX:	(814)863-7843





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