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*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

**Follow-Ups**:**Re: How to do polar plots with logarithmic axis in radial coordinate?***From:*Craig Markwardt

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