Ordering a list in Mathematica

HannahB

Hi everyone,

Is it possible to order a list of (x,y) coordinates in Mathematica by x, then y? I currently have a number of data files in which there are 5 columns: x, y, area, circularity, radius. I would like to order the list by x and y coordinates while keeping the rows intact.

Thank you

CompuChip

There is

Code:

Sort[list, p]
sorts using the ordering function p.

For p you could use something like

Code:

p[a_, b_] := (a[[1]] < b[[1]]) || (a[[1]] == b[[1]] && a[[2]] < b[[2]])

Similar discussions for: Ordering a list in Mathematica
Thread	Forum	Replies
Mathematica: Position of elements in a list	Math & Science Software	3
Mathematica:Iteration of pairs in a list	Math & Science Software	3
A list of functions in Mathematica?	Math & Science Software	3
Mathematica List Plot	Math & Science Software	3
Mathematica List Plot	Math & Science Software	2

HannahB	Ordering a list in Mathematica Hi everyone, Is it possible to order a list of (x,y) coordinates in Mathematica by x, then y? I currently have a number of data files in which there are 5 columns: x, y, area, circularity, radius. I would like to order the list by x and y coordinates while keeping the rows intact. Thank you

CompuChip Blog Entries: 6 Recognitions: Homework Help Science Advisor	There is Code: Sort[list, p] sorts using the ordering function p. For p you could use something like Code: p[a_, b_] := (a[[1]] < b[[1]]) \|\| (a[[1]] == b[[1]] && a[[2]] < b[[2]])