Re: Algorithm Analysis Course: Should I use Mathematica for projects? //oops, typos
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- Subject: [mg127288] Re: Algorithm Analysis Course: Should I use Mathematica for projects? //oops, typos
- From: Richard Fateman <fateman at cs.berkeley.edu>
- Date: Sat, 14 Jul 2012 01:29:28 -0400 (EDT)
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On 7/12/2012 11:57 PM, Richard Fateman wrote:
Sorry, some errors crept into my demo examples as I tried
to simplify them for inclusion in the email...
>
> An example.
>
> Create 3 arrays.
>
> A=Table[i,{i,0,100}];
> B=Table[i,{i,0,1000}];
> Q=Table[i,{i,0,10000}];
>
> Try updating the 50th element of each of these items, which look like
> arrays in Mathematica.
>
> Timing [A[[50]],{i,0,100000}]
Should be Timing[Do[A[[50]]++, {i, 0, 100000}]]. My computer reports
0.281 sec
>
> Timing [B[[50]],{i,0,100000}]
Should be B[[5]]=j; Timing[Do[B[[50]]++, {i, 0, 100000}]]. My computer
reports 1.266 sec
>
> Timing [Q[[50]],{i,0,100000}]
Should be Timing[Do[Q[[50]]++, {i, 0, 100000}]]. My computer reports
0.421 sec
>
Apologies for sowing confusion unnecessarily.
RJF