Dear Frank,
you can use grconvertY and grconvertX to convert from user coordinates
to inches etc and vice versa.
E.g.
lines(rep(.25*1500,2),grconvertY(grconvertY(par("usr")[3],"user","inches")+c(0,.1),from="inches",to="user"))
should produce a tick of 0.1 inches height, regardless of the actual
plot height.
Hope this helps.
Am 26.07.2013 13:57, schrieb Frank Harrell:
> Thanks Rich and Jim and apologies for omitting the line
>
> x <- c(285, 43.75, 94, 150, 214, 375, 270, 350, 41.5, 210, 30, 37.6,
> 281, 101, 210)
>
> But the fundamental problem remains that vertical spacing is not correct
> unless I waste a lot of image space at the top.
>
> Frank
>
>
--
Eik Vettorazzi
Department of Medical Biometry and Epidemiology
University Medical Center Hamburg-Eppendorf
Martinistr. 52
20246 Hamburg
T ++49/40/7410-58243
F ++49/40/7410-57790
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