R devel - Jul 2008 - axis() ignores supplied value of argument mgp[3]?

It seems that when an argument 'mgp' is supplied to axis(),
the mgp[2] value (position of tick mark labels) is honoured
but the mgp[3] value (position of axis line) is ignored.
Example:

   plot(1:5, xaxt='n', ann=FALSE)
   par(mgp=c(0,2,1))
   axis(1, at=2:4, mgp=c(0,-2,-3))

Axis line is plotted at margin line 1, tick mark labels at line -3.

Is this a bug?


J. R. M. Hosking



 > R.version
                _
platform       i386-pc-mingw32
arch           i386
os             mingw32
system         i386, mingw32
status
major          2
minor          7.1
year           2008
month          06
day            23
svn rev        45970
language       R
version.string R version 2.7.1 (2008-06-23)

What is true is that the line is set before the inline setting of mgp is 
processed: it all depends on what 'supplied' means, and you supplied two
values.

This is changed in R-patched now.

On Sat, 19 Jul 2008, J. R. M. Hosking wrote:
> It seems that when an argument 'mgp' is supplied to axis(),
> the mgp[2] value (position of tick mark labels) is honoured
> but the mgp[3] value (position of axis line) is ignored.
> Example:
>
>  plot(1:5, xaxt='n', ann=FALSE)
>  par(mgp=c(0,2,1))
>  axis(1, at=2:4, mgp=c(0,-2,-3))
>
> Axis line is plotted at margin line 1, tick mark labels at line -3.
>
> Is this a bug?
>
>
> J. R. M. Hosking
>
>
>
>> R.version
>               _
> platform       i386-pc-mingw32
> arch           i386
> os             mingw32
> system         i386, mingw32
> status
> major          2
> minor          7.1
> year           2008
> month          06
> day            23
> svn rev        45970
> language       R
> version.string R version 2.7.1 (2008-06-23)
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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