[postgis-devel] [PostGIS] #926: ST_GeometryN, ST_PointN (input of array) return set

PostGIS trac at osgeo.org
Fri Apr 29 13:32:31 PDT 2011

#926: ST_GeometryN, ST_PointN (input of array) return set
 Reporter:  robe         |       Owner:  pramsey      
     Type:  enhancement  |      Status:  new          
 Priority:  medium       |   Milestone:  PostGIS 2.0.0
Component:  postgis      |     Version:  trunk        
 Keywords:               |  

Comment(by bitner):

 So.... I haven't quite figured out how to actually use this or if I am
 even barking down the right tree, but I have been trying to make sense of
 using loess/lowess for some data smoothing.

 CREATE OR REPLACE FUNCTION lowess(real[], real[])
   RETURNS real[] AS
 x <- arg1
 y <- arg2
 ret <- lowess(y,x,1,1)
   COST 100;
 select lowess(ARRAY[0.1,.51,.98,1.53,1.95,2.5],ARRAY[0,1,2,3,4,5]);

 I'm testing smoothing x vs. m, y vs. m for flight path data.

Ticket URL: <http://trac.osgeo.org/postgis/ticket/926#comment:5>
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