| print.ggplot {ggplot2} | R Documentation |
Generally, you do not need to print or plot a ggplot2 plot explicitly: the
default top-level print method will do it for you. You will, however, need
to call print() explicitly if you want to draw a plot inside a
function or for loop.
## S3 method for class 'ggplot' print(x, newpage = is.null(vp), vp = NULL, ...) ## S3 method for class 'ggplot' plot(x, newpage = is.null(vp), vp = NULL, ...)
x |
plot to display |
newpage |
draw new (empty) page first? |
vp |
viewport to draw plot in |
... |
other arguments not used by this method |
Invisibly returns the result of ggplot_build(), which
is a list with components that contain the plot itself, the data,
information about the scales, panels etc.
colours <- list(~class, ~drv, ~fl)
# Doesn't seem to do anything!
for (colour in colours) {
ggplot(mpg, aes_(~ displ, ~ hwy, colour = colour)) +
geom_point()
}
# Works when we explicitly print the plots
for (colour in colours) {
print(ggplot(mpg, aes_(~ displ, ~ hwy, colour = colour)) +
geom_point())
}