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.