MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: need to make a special function


Nabeel,

f[i] is the list of binary representations of integers from 0 to  
2^i-1 (left padded with 0's):

f = Function[i, IntegerDigits[#, 2, i] & /@ Range[0, 2^i - 1]];

For instance f[3] gives
{{0,0,0},{0,0,1},{0,1,0},{0,1,1},{1,0,0},{1,0,1},{1,1,0},{1,1,1}}

A solution in based on Distribute

f1 = Distribute[Table[{0, 1}, {#}], List, List] &;

f1[3] gives

{{0,0,0},{0,0,1},{0,1,0},{0,1,1},{1,0,0},{1,0,1},{1,1,0},{1,1,1}}

Adriano Pascoletti

On 31 lug 2006, at 09:45, 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
>
>


  • Prev by Date: Re: need to make a special function
  • Next by Date: Re: need to make a special function
  • Previous by thread: Re: need to make a special function
  • Next by thread: Re: need to make a special function