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
>
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