MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Map function which adds last two numbers of a list


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}}

This is one of many formulations that would do what you want:

Map[Append[#[[{1,2}]],Plus@@#[[{3,4}]]]&,z]

hth,

albert


  • Prev by Date: Re: Creating a Listable Function
  • Next by Date: Re: Map function which adds last two numbers of a list
  • Previous by thread: Re: Map function which adds last two numbers of a list
  • Next by thread: Re: Map function which adds last two numbers of a list