Re: pattern matching all list elements but last
- To: mathgroup at smc.vnet.net
- Subject: [mg54631] Re: pattern matching all list elements but last
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Thu, 24 Feb 2005 03:21:36 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
On 2/23/05 at 3:11 AM, hanlonr at cox.net (Bob Hanlon) wrote:
>ls={{1},{2,3},{4,5,6},{7,8,9,10}};
>ls /. {a___,b_Integer} :> {Sequence@@({a}+100),b}
>{{1},{102,3},{104,105,6},{107,108,109,10}}
Hmm... Although I consider myself reasonably proficient with Mathematica, it would not have occurred to me to use pattern matching for this problem. Instead, I would have done
{Sequence@@(Most@#+100),Last@#}&/@ls
which results in the same output.
This raises an interesting question. In general, which approach to a problem gives better performance? Pattern matching or the more functional approach?
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