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.....