geom_vline
From ggplot2 v0.9.1
by Hadley Wickham
Line, vertical.
This geom allows you to annotate the plot with vertical
lines (see geom_hline
and
geom_abline
for other types of lines.
Usage
geom_vline(mapping = NULL, data = NULL, stat = "vline",
position = "identity", show_guide = FALSE, ...)
Arguments
- show_guide
- should a legend be drawn? (defaults to
FALSE
) - mapping
- The aesthetic mapping, usually constructed
with
aes
oraes_string
. Only needs to be set at the layer level if you are overriding the plot defaults. - data
- A layer specific dataset - only needed if you want to override the plot defaults.
- stat
- The statistical transformation to use on the data for this layer.
- position
- The position adjustment to use for overlappling points on this layer
- ...
- other arguments passed on to
layer
. This can include aesthetics whose values you want to set, not map. Seelayer
for more details.
Details
There are two ways to use it. You can either specify the intercept of the line in the call to the geom, in which case the line will be in the same position in every panel. Alternatively, you can supply a different intercept for each panel using a data.frame. See the examples for the differences.
See Also
geom_hline
for horizontal lines,
geom_abline
for lines defined by a slope
and intercept, geom_segment
for a more
general approach"
Examples
# Fixed lines
p <- ggplot(mtcars, aes(x = wt, y = mpg)) + geom_point()
p + geom_vline(xintercept = 5)
p + geom_vline(xintercept = 1:5)
p + geom_vline(xintercept = 1:5, colour="green", linetype = "longdash")
p + geom_vline(aes(xintercept = wt))
# With coordinate transforms
p + geom_vline(aes(xintercept = wt)) + coord_equal()
p + geom_vline(aes(xintercept = wt)) + coord_flip()
p + geom_vline(aes(xintercept = wt)) + coord_polar()
p2 <- p + aes(colour = factor(cyl))
p2 + geom_vline(xintercept = 15)
# To display different lines in different facets, you need to
# create a data frame.
p <- qplot(mpg, wt, data=mtcars, facets = vs ~ am)
vline.data <- data.frame(z = c(15, 20, 25, 30), vs = c(0, 0, 1, 1), am = c(0, 1, 0, 1))
p + geom_vline(aes(xintercept = z), vline.data)
Community examples
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