Re: Sorting by date
- To: mathgroup at smc.vnet.net
- Subject: [mg72653] Re: Sorting by date
- From: "Ray Koopman" <koopman at sfu.ca>
- Date: Sun, 14 Jan 2007 03:58:33 -0500 (EST)
- References: <eoa6ji$mi6$1@smc.vnet.net>
Clifford Martin wrote:
> Hi All,
>
> I have a list of lists that looks like so:
>
>
> {{3, 137.5, 13978, {2005, 2, 8}}, {3, 138.5, 12519, {2005, 1, 4}}, {3, 171.9, 15835, {2005, 4, 12}}, {3, 142.8, 17137, {2005, 11, 19}},
> {3, 161.1, 18881, {2006, 1, 18}}, {3, 108.7, 20055, {2006, 2, 28}}, {3, 157, 21498, {2006, 9, 14}}, {3, 118.1, 10891, {2004, 11, 12}}}
>
> The last element per vector is a date. I'd like to sort the list so that the vectors are arranged in ascending order of date, i.e. the vector containing {2004,11,12} should be first and and the vector containing {2006,9,14} should be last. Any help would be appreciated.
>
> Thanks
>
> Cliff
RotateLeft /@ Sort[RotateRight /@ yourlist]
or
Sort[yourlist, OrderedQ[Last@#1, Last@#2]&]