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

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.
|
|

```

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