Re: Sorting nested lists with strings
- To: mathgroup at smc.vnet.net
- Subject: [mg116306] Re: Sorting nested lists with strings
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 10 Feb 2011 05:24:00 -0500 (EST)
list = {{"Paul", 48}, {"Paul", 23}, {"Amanda", 55}, {"Carl", 32}};
Sort defaults to using the first element
Sort[list]
{{"Amanda", 55}, {"Carl", 32}, {"Paul", 23}, {"Paul", 48}}
SortBy[list, First]
{{"Amanda", 55}, {"Carl", 32}, {"Paul", 23}, {"Paul", 48}}
Sort[list, OrderedQ[{#1, #2}] &]
{{"Amanda", 55}, {"Carl", 32}, {"Paul", 23}, {"Paul", 48}}
Bob Hanlon
---- Paperorbifold <kgodelNOSPAM at liberoNOSPAM.it> wrote:
=============
I've a nested list of this kind:
list={{"Paul",23},{"Amanda",55},{"Carl",32},...}
Suppose I want to perform an alphabetic sort on the first element. Which is
the condition I've to write in Sort[list,...]?
Actually Sort[list] automatically operates on the second element.
Thanks.
--
...and I will make them pay for\nwhat they've done! (J.L. Picard)