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MathGroup Archive 2005

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Re: FromDigits[{135,21}] -> 1371 (??!!)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53795] Re: FromDigits[{135,21}] -> 1371 (??!!)
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Thu, 27 Jan 2005 05:41:43 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 1/25/05 at 5:03 AM, seidovzf at yahoo.com (Zak Seidov) wrote:

>Can anyone please explain what happens, if "Digits" actually are
>"integers": 
>FromDigits[{3,2}] 32(!) 

<snip>

>it's OK above, but: 
>FromDigits[{135,21}] 1371 (??!!)

By default, FromDigits assumes base 10 and computes 10*135+21 = 1371

>And how to get integer 1323 from  list {13,23}?

There are several ways. First convert each element of the list to individual digits, combine the lists and send to FromDigits, i.e.,

FromDigits[Flatten[IntegerDigits /@ {13, 23}]]
1323

But the more elegant approach is to take advantage of the fact FromDigits can be made to work with any base. In particular,

FromDigits[{13, 23}, 100]
1323
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