Re: Sorting by date
- To: mathgroup at smc.vnet.net
- Subject: [mg72660] Re: Sorting by date
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Sun, 14 Jan 2007 04:26:41 -0500 (EST)
On 1/13/07 at 4:17 AM, camartin at snet.net (Clifford Martin) wrote: >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. Simply take advantage of the second argument to sort by supplying it a pure function that makes it simple to order dates. That is Sort[data, OrderedQ@{FromDate@Flatten@{ Last@#1, 0, 0, 0}, FromDate@Flatten@{Last@#2, 0, 0, 0}} &] will do the trick -- To reply via email subtract one hundred and four