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MathGroup Archive 1998

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Re: problem with Series

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13882] Re: problem with Series
  • From: mefisher at my-dejanews.com
  • Date: Sun, 6 Sep 1998 02:55:22 -0400
  • Organization: Deja News - The Leader in Internet Discussion
  • References: <6sikvj$48s@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

I just ran

Series[ArcCot[x],{x,0,14}]//Timing

on my new Windows NT machine and got back 49.469 Second!! By the way,
this machine scored 4.05 on the benchmark notebook. Moreover, the NT
task manager reported an increase of 152 MB of memory used as the
computation proceeded. (Fortunately I have 384 MB RAM.) The memory was
not freed up after the calculation ended, but only after exiting
Mathematica. By contrast MemoryInUse[] reported an increase of only .3
MB!! I don't know what is going on. Can anyone shed some light?

--Mark

In article <6sikvj$48s at smc.vnet.net>,
  gwesp at cosy.sbg.ac.at (Gerhard Wesp) wrote:
>   when evaluating the command Series[ArcCot[x],{x,0,14}], mathematica
> seems to use up unreasonably huge amounts of memory, for example on
> our ultrasparc i interrupted it when  ps -e -o
> user,pid,pcpu,pmem,vsz,rss,s,stime,time,args showed
>    gwesp  2071 26.2 76.2 150024 95320 S 16:53:30        1:22
> /usr/common/mathematica-3.0.1/SystemFiles/Kernel/Binaries/Solaris/MathKernel
> -r
>
> the problem also exists on linux.
>
>   taylor series computation is certainly not _that_ memory intensive, so
> this behaviour is bound to be a bug imo.
>
>   could somebody try this out on a windows95/nt machine and inform  me
> of the results?
>
> the version:
> In[21]:= {$Version,$ReleaseNumber}
>
> Out[21]= {Linux 3.0 (April 25, 1997), 1}
>
> best regards and tia,
> -gerhard wesp
> --
> | Gerhard Wesp | ++43 (0)662 8044 5320 (office) | ++43 (0)662 630329
> (home) |  http://www.cosy.sbg.ac.at/~gwesp
> | Caution: Cape does not enable user to fly. |   -- Batman costume
> warning label, Wal-Mart, 1995.
>
>

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