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MathGroup Archive 2005

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Re: How to use only part of mapping

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57298] Re: [mg57257] How to use only part of mapping
  • From: János <janos.lobb at yale.edu>
  • Date: Tue, 24 May 2005 05:12:35 -0400 (EDT)
  • References: <200505220414.AAA17638@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On May 22, 2005, at 12:14 AM, Guy Israeli wrote:

> Hi,
>
> I want to do some mapping (/@) related operations since I don't  
> want to use
> for/while loops because of all the index mayhem.
>
> The problem is that I don't need the map operation to continue once  
> some
> condition is met.
>
> Is there a way to stop the mapping operation so it will not  
> continue, thus
> saving valuable calculation time (since there is no need to continue).
>
> for example (not useful though)
>
> Print[#]&/@Range[10]
> and stop printing if #>5
>
>
> If it isn't possible to do it with map, what are my other options?
>
> Thanks,
>
> Guy
>
>

In[11]:=
Catch[Scan[If[#1 > 5,
       Throw[#1], Print[
        #1]] & , Range[10]]];
 From In[11]:=
1
 From In[11]:=
2
 From In[11]:=
3
 From In[11]:=
4
 From In[11]:=
5

János


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