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*Subject*: Re: How to do polar plots with logarithmic axis in radial coordinate?*From*: Charlie Zender <zender(at)uci.edu>*Date*: Tue, 06 Feb 2001 18:11:07 -0800*Newsgroups*: comp.lang.idl-pvwave*Organization*: University of California at Irvine*References*: <3A802C71.1070002@uci.edu> <on7l33fpp7.fsf@cow.physics.wisc.edu>*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:23408

Craig Markwardt wrote: > Could you simply take the ALOG10() logarithm of the data before > plotting it? Easier to re-label the axis than re-invent the world... > This would cause the radial coordinate to be negative-valued which would have unpleasant results. It's possible someone could get this method to work but I tried without success. > Good luck, > Craig > > > Charlie Zender <zender@uci.edu> writes: > > >> 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 >> -- 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:*Paul van Delst

**References**:**How to do polar plots with logarithmic axis in radial coordinate?***From:*Charlie Zender

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

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