Re: Algorithm Analysis Course: Should I use Mathematica for projects? //oops, typos

• To: mathgroup at smc.vnet.net
• 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)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
• Delivered-to: mathgroup-newsend@smc.vnet.net

```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

```

• Prev by Date: Re: Algorithm Analysis Course: Should I use Mathematica for projects?
• Next by Date: Re: Replace, ReplaceAll and If time performace comparition
• Previous by thread: estimated variance on parameter fit
• Next by thread: Re: Embedded HTML CDF rendered as grey box.