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MathGroup Archive 2007

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Re: How much memory is needed?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82042] Re: How much memory is needed?
  • From: Yaroslav Bulatov <yaroslavvb at gmail.com>
  • Date: Wed, 10 Oct 2007 04:27:34 -0400 (EDT)
  • References: <fefijg$jn7$1@smc.vnet.net>

On Oct 9, 2:45 am, "George Soklis" <g... at panteion.gr> wrote:
> Hi everyone,
>
> I am trying to inverse a 60x60 symbolic matrix.
>
> Is anybody aware of what memory is needed for this calculation?
>
> Thanks in advance!
>
> George

Size of Inverse output seems to exponentially with number of rows.
Fitting an exponential to first 7 sizes and extrapolating, you get
something around 6*10^56 bytes for 50x50 matrix

counts = (ByteCount[Inverse[#]] &@Array[x, {#, #}]) & /@ Range[7]
(counts[[# + 1]]/counts[[#]]) & /@ Range[Length[counts] - 1] // N
Exp[50 a] /. FindFit[counts, Exp[a x], a, x]



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