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Date: Wed, 4 Mar 2009 06:38:38 -0500
Message-ID: <7a236b8b0903040338o443f68dkaabdf9710e938be0@mail.gmail.com>
Subject: Re: Filtering a cloud of points
From: Daniel Gagne <gagne@mit.edu>
To: user@couchdb.apache.org
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Not sure if this is the best, or a workable solution , I haven't tried
it, but it may lead to one.  If you look at :
http://wiki.apache.org/couchdb/View_collation?action=3Dshow&redirect=3DView=
Collation
  It shows how views are collated at the bottom.

The example you posted could be solved by doing 3 requests - all
points in each row, and then combining them in your code:

startkey=3D[[1],[0]]&endkey=3D[[1],[5]]
startkey=3D[[2],[0]]&endkey=3D[[2],[5]]
startkey=3D[[3],[0]]&endkey=3D[[3],[5]]

Hope that helps,

danny

On Wed, Mar 4, 2009 at 6:19 AM, Manuel Padr=F3n Mar=E1rt=EDnez
<manolopm@banot.net> wrote:
> Hi :
>
> I have a problem with views (again). I have a cloud of points in a 2d spa=
ce, I mean each point has X
> and Y position, and each point is in a document:
>
> {
> =A0"Point":
> =A0 =A0 =A0{
> =A0 =A0 =A0 =A0"X":20,
> =A0 =A0 =A0 =A0"Y":30
> =A0 =A0 =A0}
> }
>
> I need to make a view to filter a region of space, I mean all the points =
between X0-X1 and Y0-Y1.
> I've tried to make a view like this:
>
> MAP:
> function(doc) {
> =A0emit([[doc.X],[doc.Y]], doc);
> }
>
> And tried to filter with start - end key (for example : startkey=3D[[1],[=
0]]&endkey=3D[[3],[5]]) but I
> get points that are out of region (like [[1][9]]).
> I've also tried with objects, simple vectos ([X,Y]) and still the same re=
sults.
>
> Anyone knows how to solve it? There any way ? Or should I make a view for=
 X coordinate, another for Y
> coordinate and try to make a ""join"" in my program?
>
> Thanks in advance
>
> Manuel Padr=F3n Mart=EDnez
>