# How to do polar plots with logarithmic axis in radial coordinate?

• Subject: How to do polar plots with logarithmic axis in radial coordinate?
• From: Charlie Zender <zender(at)uci.edu>
• Date: Tue, 06 Feb 2001 08:55:13 -0800
• Newsgroups: comp.lang.idl-pvwave
• Organization: University of California at Irvine
• User-Agent: Mozilla/5.0 (X11; U; Linux 2.2.16-22 i686; en-US; m18) Gecko/20001205
• Xref: news.doit.wisc.edu comp.lang.idl-pvwave:23391

```Hi,

I am wondering if anyone has tried to plot higly peaked polar
coordinate data. I am referring to data that are a function of
angle (-pi to pi) where the data are very sharply peaked in
some direction, so much so that the radial coordinate must
be logarithmic in order to display the data. The so-called
scattering phase function of small particles is the exact
application where I have run into this problem. Using /polar
on a regular call to plot, as recommended by the user's guide
and by Fanning's hints page, only seems to work well when the
x-axis is not set to be logarithmic. Very weird things begin
to happen when setting the xlog=1 or ylog=1 keywords when /polar
is set.

The data span five decades from 1.0e-5 to 1.0.
If anyone can tell me how to make this look in polar coordinates
I'd be very grateful. Ideally the solution will a polar coordinate
plot where the radial coordinate is logarithmic, and thus has
a "hole" around the origin (so the minimum plotted coordinate could
be, e.g., 10^-6). But I'm open to anything that looks good.

Thanks,
Charlie
--
Charlie Zender zender@uci.edu (949) 824-2987/FAX-3256, Department of
Earth System Science, University of California, Irvine CA 92697-3100

```