Re: Summing elements within a List or Array

*To*: mathgroup at smc.vnet.net*Subject*: [mg69567] Re: [mg69524] Summing elements within a List or Array*From*: gardyloo <gardyloo at mail.wsu.edu>*Date*: Fri, 15 Sep 2006 06:46:57 -0400 (EDT)

Plus @@ (# // Flatten) & /@ alist (flatten each row/column of the list, then apply Plus to each of the results) I think that'll do what you want. Cheers, C.O. John Adeosun wrote: > Hello Everyone, > > I generated an intended list of real numbers using Mathematica 5.2, say > "alist", that looks like: > > alist = {{0}, {{1.2},0}, {{2.3},{1.2},0},{{3.4},{2.3},{1.2},0}, > ................{{99.0},{98.9},{97.8},.......,0}} > (In Matrix form, this "alist" can be shown as a LowerDiagonal Matrix) > > Meanwhile, my present goal is to then program using Mathematica to obtain a > list, say "aalist", having each element equal to the sum of the elements in > each(corresponding) sublist of the original list "alist." That is, > > aalist = {0, 1.2, 3.5, 6.9,...........} > > In essence, it is like reducing, say, 100 by 100 matrix to 100 by 1 matrix > via summing operation. > > I programmed using some summing operations/functions in Mathematica to no > avail. I don't know what I 'm doing wrong. > > Can anyone help with this problem? > > Thanks, > > John. > > > > -- ========================================================== Curtis Osterhoudt gardyloo at mail.remove_this.wsu.and_this.edu PGP Key ID: 0x088E6D7A Please avoid sending me Word or PowerPoint attachments See http://www.gnu.org/philosophy/no-word-attachments.html ==========================================================