Re: Map function which adds last two numbers of a list
- To: mathgroup at smc.vnet.net
- Subject: [mg73571] Re: [mg73530] Map function which adds last two numbers of a list
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Thu, 22 Feb 2007 04:30:22 -0500 (EST)
- References: <200702210646.BAA18238@smc.vnet.net>
On Feb 21, 2007, at 1:46 AM, Christopher Pike wrote:
>
> Hi,
> Consider this:
>
> z = {{1,4,5,6},{7,8,9,1},{1,2,4,3}}
>
> I'd like to Map a function onto z which would replace the last two
> items
> with their sum:
>
> {{1,4,11},{7,8,10},{1,2,7}}
>
> I could easily use the Table command to construct this new table,
> but it
> would be nicer if I new how to Map some function on z that would
> produce
> the same result.
>
> Any suggestions.
Append[Take[#,Length[#]-2],#[[-2]]+#[[-1]]]&/@z
This only works if the sublists are at least two elements long.
Regards,
Ssezi
- References:
- Map function which adds last two numbers of a list
- From: "Christopher Pike" <crpike@ucdavis.edu>
- Map function which adds last two numbers of a list