Plotting error bars in xy-direction
Hans W Borchers wrote:
Dear R-help,
I am looking for a function that will plot error bars in x- or y-direction
(or
both), the same as the Gnuplot function 'plot' can achieve with:
plot "file.dat" with xyerrorbars,...
Rsite-searching led me to the functions 'errbar' and 'plotCI' in the
Hmisc,
gregmisc, and plotrix packages. As I understand the descriptions and
examples,
none of these functions provides horizontal error bars.
Looking into 'errbar' and using segments, I wrote a small function for
myself
adding these kinds of error bars to existing plots. I would still be
interested
to know what the standard R solution is.
Regards, Hans Werner
plotCI from plotrix will do horizontal error bars --
from ?plotCI:
err: The direction of error bars: "x" for horizontal, "y" for
vertical ("xy" would be nice but is not implemented yet;
don't know quite how everything would be specified. See
examples for composing a plot with simultaneous horizontal
and vertical error bars)
Ben Bolker
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