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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


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