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MathGroup Archive 2006

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Re: need to make a special function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68317] Re: need to make a special function
  • From: "sashap" <pavlyk at gmail.com>
  • Date: Tue, 1 Aug 2006 06:59:44 -0400 (EDT)
  • References: <eakec7$qvd$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Nabeel,

You could try the following

In[1]:=
f[k_Integer]:=IntegerDigits[#,2,k]& /@ Range[0,2^k-1]

In[2]:=
f[10];//Timing

Out[2]=
{0. Second,Null}

In[3]:=
f[20];//Timing

Out[3]=
{1.047 Second,Null}

In[4]:=
f[3]

Out[4]=
{{0,0,0},{0,0,1},{0,1,0},{0,1,1},{1,0,0},{1,0,1},{1,1,0},{1,1,1}}

Oleksandr Pavlyk
Wolfram Research



Nabeel Butt wrote:
> Dear Users,
>         I need help on making a special type of function which has the
> following properties.
>    f[1]={{0},{1}}
>    f[2]={{0,0},{0,1},{1,0},{1,1}}
>    f[3]={{0,0,0},{0,0,1},{0,1,0},{0,1,1},{1,0,0},{1,0,1},{1,1,0},{1,1,1}}
> .............so on you can see the pattern emerging.
>  I need a very efficient code to perform the above evaluation in some
> optimization problem.
>     Thanks in advance.
>      regards,
>         Nabeel
> -- 
> Nabeel Butt
> LUMS,Lahore


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