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sum with lists

• To: mathgroup at smc.vnet.net
• Subject: [mg40534] sum with lists
• From: "Nathan Moore" <nmoore at physics.umn.edu>
• Date: Wed, 9 Apr 2003 20:26:04 -0400 (EDT)
• Organization: University of Minnesota, Physics
• Sender: owner-wri-mathgroup at wolfram.com

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}]

I tried 
    Sum[d[[i, 1]]*d[[i, 3]], {i, 0, 10}]
with little success

thanks,

Nathan Moore,
University of Minnesota Physics

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  • Re: sum with lists
    • From: Dr Bob <majort@cox-internet.com>