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Re: coordinates in LogLogPlots

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112150] Re: coordinates in LogLogPlots
  • From: Joseph Gwinn <joegwinn at comcast.net>
  • Date: Thu, 2 Sep 2010 02:31:33 -0400 (EDT)
  • References: <i5l9pf$7e6$1@smc.vnet.net>

In article <i5l9pf$7e6$1 at smc.vnet.net>, Alessandro <alexxx.magni at gmail.com> 
wrote:

> my fault without doubt, I keep on banging my head against the surreal
> coordinate usage in Mathematica.
> 
> Currently I am trying to place a Disk[] in the Epilog section of a
> LogLogPlot - using as disk coordinates the plot coordinates - and I
> see that it doesnt work, I dont know why.
> 
> Show[LogLogPlot[700*x^-0.4, {x, 100, 10^6}, Frame -> True,  PlotRange -
> > {{10, 10^6}, {1, 100}},
>  Epilog -> {Disk[{3,4.2},0.1]}]

What often works in such situations is to use Log to transform into the 
underlying coordinate system of the plot.  So, your example would become (but I 
didn't test it):

Show[LogLogPlot[700*x^-0.4, {x, 100, 10^6}, Frame -> True, ... ,
 Epilog -> {Disk[{Log[3],Log[4.2]},Log[0.1]]}]


Joe Gwinn


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