Re: Question about Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg106565] Re: [mg106544] Question about Mathematica
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Sat, 16 Jan 2010 06:13:24 -0500 (EST)
- References: <201001151200.HAA07995@smc.vnet.net>
- Reply-to: drmajorbob at yahoo.com
data = {{{1, 2}, {3, -1}, {2, -4}}, {{1,
2}, {4, -5}, {6, -8}}, {{2, -1}, {-2, -3}, {-4, 6}}};
Reverse /@ (Sort /@ Map[Reverse, data, {2}])[[All, 1]]
{{2, -4}, {6, -8}, {-2, -3}}
or
(SortBy[#, Last] & /@ data)[[All, 1]]
{{2, -4}, {6, -8}, {-2, -3}}
Bobby
On Fri, 15 Jan 2010 06:00:46 -0600, Dominic <miliotodc at rtconline.com>
wrote:
> Hi. Can someone help me with the following question:
>
> I have a table of a table of number pairs:
>
> {{{1,2),(3,-1),{2,-4)},{{1,2},{4,-5},{6,-8}},{{2,-1},{-2,-3},{-4,6}}}
>
> How may I find the minimum second element in each sub-table? For
> example, the first sub-table is:
>
> {{1,2},{3,-1},{2,-4}}
>
> I would like to then extract the {2,-4} element from this item. Then
> the {6,-8} from the second sub-table, then the {-2,-3} element from the
> last.
>
> Thank you,
> Dominic
>
>
--
DrMajorBob at yahoo.com
- References:
- Question about Mathematica
- From: "Dominic" <miliotodc@rtconline.com>
- Question about Mathematica