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