[Rd] yinch() is NOT nonsense with log='y'

Spencer Graves spencer.graves at structuremonitoring.com
Wed May 7 19:25:10 CEST 2014

       May I request a modest change in the documentation and warning 
for "xinch", "yinch", and "xyinch"?

       Consider the following example:

 > plot(1:2, log='y')
 > yinch(1)
[1] 0.1961134
Warning message:
In yinch(1) : y log scale:  yinch() is nonsense

       In fact, in this environment, "yinch(y)" translates a vertical 
displacement of "y" inches into the corresponding change in the log10 
scale.  For a realistic example of such a use, see the first example of 
the current R-Forge version of the new "animate" function in the "Ecfun" 
package:  This places the Rlogo on a plot(..., log='y') without distortion.

       Spencer Graves

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