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MathGroup Archive 1995

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Re: Converting table to a number?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg2112] Re: Converting table to a number?
  • From: villegas (Robert Villegas)
  • Date: Wed, 4 Oct 1995 01:52:46 -0400
  • Organization: Wolfram Research, Inc.

> I have a list of numbers, such as this:
> 
>         { 1, 0, 1, 1, 0, 1, 0, 0 }
> 
> and I want to convert it into this:
> 
>         10110100 (binary)


If you just want something to display as the binary sequence, you can
join the digits into a string:

In[4]:= StringJoin[ToString /@ { 1, 0, 1, 1, 0, 1, 0, 0 }]

Out[4]= 10110100

or use a formatting function that displays its elements in a horizontal
sequence:

In[5]:= SequenceForm @@ { 1, 0, 1, 1, 0, 1, 0, 0 }

Out[5]= 10110100



If you want to form the actual integer, you can use the ^^ operator:

In[6]:= 2^^10110100

Out[6]= 180


Here's a function that makes it easy to convert a base and a string or list
of digits to the represented integer:

-----------------------------------------------------------------------------
BasePower[base_, digits_String] := ToExpression[ToString[base] <> "^^" <>  
digits]

BasePower[base_, digits:{__String}] := BasePower[base, StringJoin[digits]]

$letters = FromCharacterCode /@ Range[64 + 1, 64 + 26]

$todigits = Thread[Range[10, 35] -> $letters]

BasePower[base_, digits:{__Integer}] :=
  BasePower[base, ToString /@ (digits /. Thread[Range[10, 35] -> $letters]) ]
-----------------------------------------------------------------------------

It works up to base 36.  You can give digits as actual integers, or as
letters:

In[6]:= BasePower[16, {13, 12, 11}]

Out[6]= 3531

In[7]:= BasePower[16, "DCB"]

Out[7]= 3531

In[8]:= BasePower[16, {"D", "C", "B"}]

Out[8]= 3531



Robby Villegas



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