comp.lang.idl-pvwave archive - RDF feed
type: channel
description: Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
items: Re: extrapolation and gridding of data

Re: extrapolation and gridding of data
type: item
description: In article <32nr09$igl@senator-bedfellow.MIT.EDU>, russell@athena.mit.edu (Russell L Scott) wrote: > Hello! > > I was trying to grid irregularly spaced data using triangulate and trigrid. The > problem is that IDL will not extrapolate beyond the triangularization defined by > the known values. So what we are looking for is a gridding routine that uses a > method like "1/r^2" to specify the grid point values. Is there a routinue like > this in the user functions??? > > Thanks, > > Russ Scott To me it seems what you are looking for is a sophisticated interpolation/extrapolation method. In order to do a meaningful inter-/extrapolation one has to make some assumptions about the continuous function underlying the irregular samples one has at hand. Which assumptions are you willing to make, e.g. bandlimitedness? Hans-Martin Adorf -- Hans-Martin Adorf ST-ECF/ESO Karl-Schwarzschild-Str. 2 D-85748 Garching b. Muenchen Germany Tel: +49-89-32006-261 Fax: +49-89-32006-480 Internet: adorf@eso.org
creator: adorf
date: 1994-08-16T08:31:28-00:00