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MathGroup Archive 1992

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Re: Can Mathematica invert large complex arrays (......)

  • To: MathGroup at yoda.physics.unc.edu
  • Subject: Re: Can Mathematica invert large complex arrays (......)
  • From: Don_H_Olive <OLIVE at orph14.phy.ornl.gov>
  • Date: Fri, 15 May 1992 11:18 EST

>Gregory Lampshire asks about the time required to invert a 700x700
>array in Mathematica.

>I just did the following on an HP 9000/877 (snakes processor).

>In[13]:= Timing[Inverse[Table[Random[],{700},{700}]]]//First

>Out[13]= 315.05 Second

>The Timing command returns a list consisting of the time and the
>answer.  First grabs the time and throws away the answer, since I
>didn't want my screen cluttered with 490000 numbers.

>I did this after a whole day of working with mathematica.  It
>pushed the virtual memory consumption up to 50144K.  I'm not sure how
>much I had consumed up to the point where I did this example, but it
>probably wasn't over 15 MB.  

>This is on an HP snakes processor.  "Your milage may vary."


On an IBM RISC System 6000 running MMa 2.0

I did the same:

In[1]:=   Timing[Inverse[Table[Random[],{700},{700}]]]/First

Out[1]:=  218.2 Second

In[2]:=   MaxMemoryUsed[]

Out[2]:=  42902884

Don Olive at orph01.bitnet.....







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