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From: murthy_j@jhunix.HCF.JHU.EDU (Jayant Murthy)
Newsgroups: comp.lang.idl-pvwave
Subject: Re: contouring an (r,theta) grid
Message-ID: <7656@jhunix.HCF.JHU.EDU>
Date: 27 Feb 91 16:26:56 GMT
References: <1991Feb23.223057.12666@murdoch.acc.Virginia.EDU>
Organization: The Johns Hopkins University - HCF
Lines: 11

In article <1991Feb23.223057.12666@murdoch.acc.Virginia.EDU> gl8f@astsun7.astro.Virginia.EDU (Greg Lindahl) writes:
>What's the easiest way to take a rectangular grid done in r,theta
>coordinates and contour it in x,y? One way would be to interpolate the
>data onto x,y; is there a library routine that does this easily?
>
>I looked and didn't see one, but I'm new to IDL.

anymore is to use CONGRID to change from one coordinate system to the other.
I have not yet tried to do this with Version 2 IDL but it looks like
you should be able to use POLYWARP.
Jayant Murthy Dept. of Physics JHU