Re: sum with lists
- To: mathgroup at smc.vnet.net
- Subject: [mg40591] Re: sum with lists
- From: Bill Rowe <listuser at earthlink.net>
- Date: Thu, 10 Apr 2003 03:43:56 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 4/9/03 at 8:26 PM, nmoore at physics.umn.edu (Nathan Moore) wrote:
>Another list question. Suppose that I have the list d={ {x0,y0,z0},
>{x1,y1,z1},
>{x2,y2,z1},
>...
>{xn,yn,zn}}
>
>and now I'd like to calculate the sum, Sum[x[i]*z[i],{i,0,n/2}]
A simple way to do this would be
Tr[Take[d, Floor[n/2].{1,0,1}]
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