[R] Two-sided log axis

[David Winsemius]

On Jun 10, 2009, at 12:23 PM, David Winsemius wrote:

> I would not have called such an axis "logarithmic" since the  
> logarithm function is bounded below at 0,

(I meant to say that arguments to log are bounded at zero.)

> but I think that what you seek will be found among the examples that  
> accompany Sarkar's book, chapter 8, figures 8.3 - 8.5:
>
> http://lmdvr.r-forge.r-project.org/figures/figures.html
>
>
> On Jun 10, 2009, at 12:05 PM, John Wiedenhoeft wrote:
>
>> Hi,
>>
>> I have two curves that are best displayed using a logarithmic y- 
>> axis. I want
>> to plot the difference of these curves, which means I would need a  
>> log scaling
>> on both the negative and the positive side (i.e. the y-axis should  
>> be -100 -10
>> -1 0 1 10 100). Zero values should not be discarded.
>>
>> Is there an easy way to do that?
>>
>> Thanks,
>> John
>>
>>

David Winsemius, MD
Heritage Laboratories
West Hartford, CT