[R] Width of bars in barplot2
Marc Schwartz (via MN)
mschwartz at mn.rr.com
Wed Mar 1 18:18:16 CET 2006
On Wed, 2006-03-01 at 12:01 -0500, Jamieson Cobleigh wrote:
> I'm using barplot2 to plot some data. Is there any way to determine
> the width of the bars in the generated plot? I know that barplot2
> returns a list of the coordinates of the center of each bar, but since
> there is some white space between each bar, I don't know how to get
> the width of each bar.
Unless you have modified the 'width' argument, the default width is 1.
Thus the sides of the bars are the centers +/- 0.5.
If you modified the width argument, then the widths are set to the
This behavior is the same in barplot() and barplot2() by design.
As an example:
# Draw a barplot. adjust the y axis to make some room
# above the bars
mp <- barplot2(1:10, ylim = c(0, 12))
# Draw lines showing the bar width limits
arrows(mp - 0.5, 2:11, mp + 0.5, 2:11, angle = 90, code = 3)
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