On Tue, 30 Dec 2008, m.u.r. wrote:
i've noticed a strange problem when plotting a stepfun.
according to the documentation, the xlim parameter should bound the
range of the function being plotted, and is returned as the extreme
Wheere does it say that? The help actually says
xlim,ylim: numeric(2) each; range of 'x' or 'y' values to use. Both
have sensible defaults.
They are just passed on to plot.window. You may be looking for par
'xaxs' (and 'xpd').
two values (i.e. first and last) in the vector t from the plot.stepfun
call. instead, it plots beyond the desired range (although the limits
are preserved for the viewing space).
to reproduce:
foo <- stepfun(0.5, c(1, 0));
bar <- plot(foo, xlim = c(0, 1));
Why are you adding two blank commands via the semicolons?
now look at the plot, notice how the function extends beyond the
desired range. also look at bar, which contains the vector t showing
the actual bounds (-1, 2) chosen by the function:
$t
[1] -1.0 0.5 2.0
does anyone have an idea for me to limit the plotted function to the
specified extreme values (in this example c(0, 1))?
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--
Brian D. Ripley, rip...@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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