Re: Summing elements within a List or Array
- To: mathgroup at smc.vnet.net
- Subject: [mg69557] Re: Summing elements within a List or Array
- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
- Date: Fri, 15 Sep 2006 06:45:59 -0400 (EDT)
- Organization: Uni Leipzig
- References: <eebfs6$57q$1@smc.vnet.net>
Hi, I also don't know what you are doing wrong because aalist = Plus @@ Flatten[#] & /@ alist will do what you want and aalist = Total[ Flatten[#]] & /@ alist will do it and aalist = Flatten[Total[ #] & /@ alist] also. Regards Jens "John Adeosun" <jtadeosun at yahoo.com> schrieb im Newsbeitrag news:eebfs6$57q$1 at smc.vnet.net... | 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. | |