R help - Jan 2001 - Intentional behaviour of par()$usr?

I had some trouble getting some text in the right place on a 
plot with logartimic y-axis, until I discovered:
> plot(NA, xlim=1:2, ylim=c(5,500), log="y")
> par()$usr
[1] 0.96000 2.04000 0.61897 2.77897
> 10^(par()$usr[3:4])
[1]   4.158819 601.132217

Is this a bug or a facility? 
It is not mentioned under par -> usr in the manual.

Bendix

----------------------
Bendix Carstensen
Senior Statistician
Steno Diabetes Centre
Niels Steensens Vej 2
DK-2820 Gentofte
Denmark
tel: +45 44 43 87 38
mob: +45 28 25 87 38
fax: +45 44 43 73 13
bxc at novo.dk
www.biostat.ku.dk/~bxc
----------------------


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>>>>> "BXC" == BXC (Bendix Carstensen) <bxc at
novonordisk.com> writes:
    BXC> I had some trouble getting some text in the right place on a plot
    BXC> with logartimic y-axis, until I discovered:

what trouble did you have exactly ?

  plot(NA, xlim=1:2, ylim=c(5,500), log="y") 
  text(1,200, "(1,200)", adj = 0)

works perfectly for me.

    >> plot(NA, xlim=1:2, ylim=c(5,500), log="y") 
    >> par()$usr
    BXC> [1] 0.96000 2.04000 0.61897 2.77897
    >> 10^(par()$usr[3:4])
    BXC> [1] 4.158819 601.132217

    BXC> Is this a bug or a facility?  

"feature" is how we call these ...

    BXC> It is not mentioned under par -> usr in the manual.

what do you propose to say there?

  { Ideally we get a diff of src/library/base/man/par.Rd }

Martin Maechler <maechler at stat.math.ethz.ch>
http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><
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