ggplot2 包 position_dodge 命令中参数 width 什么意思

战立侃 · 2018-05-19

1. 看下面的图
df <- data.frame(x = 1, y = 1, grp = c("A", "B"))
DT::datatable(df, rownames = FALSE, width = 50, fillContainer = FALSE, options = list(pageLength = 8, searching = FALSE, info = FALSE, bLengthChange = FALSE))
1. ggplot2 软件包中 position_dodge 命令的说明文档如下：
   width: Dodging width, when different to the width of the individual
elements. This is useful when you want to align narrow geoms
     geom_bar(mapping = NULL, data = NULL, stat = "count",
position = "stack", ..., width = NULL, binwidth = NULL, na.rm = FALSE,
show.legend = NA, inherit.aes = TRUE)

width: Bar width. By default, set to 90% of the resolution of the
data.
Compute the "resolution" of a numeric vector
The resolution is the smallest non-zero distance between adjacent
values.  If there is only one unique value, then the resolution is
defined to be one. If x is an integer vector, then it is assumed
to represent a discrete variable, and the resolution is 1.
Details:

Note the the "width" and "height" of a text element are 0, so
stacking and dodging text will not work by default, and axis
limits are not automatically expanded to include all text.
Obviously, labels do have height and width, but they are physical
units, not data units. The amount of space they occupy on that
plot is not constant in data units: when you resize a plot, labels
stay the same size, but the size of the axes changes.