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

*To*: mathgroup at smc.vnet.net*Subject*: [mg73559] Re: Map function which adds last two numbers of a list*From*: dh <dh at metrohm.ch>*Date*: Wed, 21 Feb 2007 06:08:46 -0500 (EST)*References*: <ergqrb$jg0$1@smc.vnet.net>

Hi Christopher, write a function that takes a list and replaces its last 2 elements by their sum. Then map this function to z: Append[Drop[#, -2], #[[-1]] + #[[-2]]]& /@ z Daniel 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. > > Thanks, Chris Pike >