Re: Sorting by date
- To: mathgroup at smc.vnet.net
- Subject: [mg72665] Re: Sorting by date
- From: "Drago Ganic" <dganic at vodatel.net>
- Date: Sun, 14 Jan 2007 04:46:47 -0500 (EST)
- References: <eoa6ji$mi6$1@smc.vnet.net>
Hi,
you should use Sort but change the default ordering function from
OrderedQ[{#1, #2}] &
to
OrderedQ[{#1[[3]], #2[[3]]}] &
because it's only the third column you would like to use for sorting.
Here is yoz example:
tbl = {
{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}}
}
Sort[data, OrderedQ[{#1[[3]], #2[[3]]}] & ]
{
{3, 118.1, 10891, {2004, 11, 12}},
{3, 138.5, 12519, {2005, 1, 4}},
{3, 137.5, 13978, {2005, 2, 8}},
{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}}
}
You can use $PrePrint = TableForm[#1, TableDepth -> 2] & for printing this
table.
Greetings from Croatia,
Drago Ganic
"Clifford Martin" <camartin at snet.net> wrote in message
news:eoa6ji$mi6$1 at smc.vnet.net...
> 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
>