Re: Help please: Summing a list

*To*: mathgroup at smc.vnet.net*Subject*: [mg13513] Re: Help please: Summing a list*From*: Hans Staugaard <hans.staugaard_NO_SPAM_ at _NO_SPAM_get2net.dk>*Date*: Fri, 31 Jul 1998 04:33:27 -0400*Organization*: Get2Net Internet Kunde*References*: <6pebm8$i6j@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

robpetersonSPAMME at iname.com skrev: > > I make a list of numbers, eg: > > P=Table[6,{x,0,110}]; (I have a more interesting list to use later if I > get this working) > > Now I want to make another list PP in which each entry PP[[i]] is the > sum of P's first i entries. I try > > PP[[i]]:=Sum[P[[n]],{n,0,i}]; > > At the definition, I get the following error: Part::"pspec": > "Part specification \!\(n\) is neither an integer nor a list of > integers." > > I don't know how to make n an integer. In the definition of Sum[], it > seems n is an integer unless you add a forth parameter "di" in the > specification list such as > Sum[f, {i, imin, imax, di}] > > Can anyone help me to generate this second list? > > Thanks, Rob I hope this can help you In[11]:= P=Range[10] Out[11]= {1,2,3,4,5,6,7,8,9,10} In[12]:= PP=FoldList[Plus,First[P],Rest[P]] Out[12]= {1,3,6,10,15,21,28,36,45,55}