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.....