Re: coordinates in LogLogPlots

*To*: mathgroup at smc.vnet.net*Subject*: [mg112148] Re: coordinates in LogLogPlots*From*: "Carl K. Woll" <carlw at wolfram.com>*Date*: Thu, 2 Sep 2010 02:31:11 -0400 (EDT)

On 9/1/2010 5:27 AM, Alessandro 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]}] > > Since it seems to me that also the Legend system is broken in Log > plots, do you know if this is also true in this case? > > thanks! > > alessandro > > Try something like: Epilog -> {Disk[Log@{100, 10}, .1]} to produce a disk centered at {100, 10}. If the oblong shape of the disk is a problem, you can use something like: Epilog -> {Disk[Log@{100, 10}, 0.1 {GoldenRatio, 1}]} instead. Carl Woll Wolfram Research