Re: Help needed with List!

• To: mathgroup at smc.vnet.net
• Subject: [mg16923] Re: Help needed with List!
• From: dreiss at !SPAMscientificarts.com (David Reiss)
• Date: Thu, 8 Apr 1999 02:32:33 -0400
• References: <7ec5kg\$cu2@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```In article <7ec5kg\$cu2 at smc.vnet.net>, alvaroo at my-dejanews.com wrote:

> 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 ==----------

The following should do the trick:

In[1]:= IntegerDigits[123456]

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

In[2]:= A = {1,2,3,4}

Out[2]= {1,2,3,4}

In[3]:=  B = {1,2}

Out[3]= {1,2}

In[4]:= DeleteCases[A, Alternatives@@B]

Out[4]= {3,4}

Regards,

David

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