Re: Help needed with List!

• To: mathgroup at smc.vnet.net
• Subject: [mg16921] Re: Help needed with List!
• From: "Atul Sharma" <mdsa at musica.mcgill.ca>
• Date: Thu, 8 Apr 1999 02:32:32 -0400
• References: <7ec5kg\$cu2@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```I think you'll find IntegerDigits[ ] and Complement[ ] to be useful for this
purpose:

In[9]:=    listA=123456
listB=12

Out[9]=    123456
Out[10]=    12

In[11]:=    ida=IntegerDigits[listA]
idb=IntegerDigits[listB]

Out[11]=    {1,2,3,4,5,6}
Out[12]=    {1,2}

In[13]:=    Complement[ida,idb]
Out[13]=    {3,4,5,6}

alvaroo at my-dejanews.com wrote in message <7ec5kg\$cu2 at smc.vnet.net>...
>Sirs Probably these are FAQs but I am new in this newsgroup and I have not
>been able to solve them. I use Mathematica 3.0:  (i) I need to convert a
long
>integer number in List format. For example if I had the number 123456 I
need
>to convert it into {1,2,3,4,5,6}:  Is it possible with an instruction? And,
>(ii) I need to delete from a List A the common elements with other List B:
>for example if A = {1,2,3,4} and B = {1,2} I need to delete by an
instruction
>the elements 1, 2 of List B from List A to obtain List C = {3,4}.  I am
>working with integers with 10.000 digits or more so you can appreciate how
>helpful for me it would be to solve these questions.  Thanks in advance.
>alvaroo
>
>-----------== Posted via Deja News, The Discussion Network ==----------
>http://www.dejanews.com/       Search, Read, Discuss, or Start Your Own
>

```

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