
Re: Euclidean distance of all pairwise combinations (redundants)
Posted:
Nov 15, 2012 4:02 AM


Jesse,
Just use Tuples instead of Subsets. Nothing else changes.
EuclideanDistance @@@ Tuples[list, {2}]
{0, Sqrt[2], 2 Sqrt[2], Sqrt[2], 0, Sqrt[2], 2 Sqrt[2], Sqrt[2], 0}
Is that what you are looking for?
Ralph Dratman
On Wed, Nov 14, 2012 at 1:29 AM, Jesse Pisel <jessepisel@gmail.com> wrote:
> I have been having a tough time trying to figure out how to include all > red undant pairwise combinations in my results for the euclidean distance > between a set of points. I have a set of points with xy coordinates and > want the euclidean distance between each point including the point and > itself. So if my points in xy space are list = {{1, 1}, {2, 2}, {3, 3}} for > example, I want the distance from {1, 1} to {1, 1}, {1, 1} to {2, 2}, and > {2, 2} to {3, 3} etc. for each point for a total of 9 distances all > together. The EuclideanDistance function removes the redundant distances > that I want retained in the results. I have been using this code just to > play with data but would like to be able to expand up to 500+ points: > > list = {{1, 1}, {2, 2}, {3, 3}} > EuclideanDistance @@@ Subsets[list, {2}] > > Any ideas on how to get the euclidean distance between all the points > including redundants and self references? > > >

