It would be nice if the included geom_step example did not throw, but behaved more like the included geom_line example.
library('ggplot2')
d <- data.frame(x=1,y=1)ggplot(data=d,aes(x=x,y=y)) + geom_point()
ggplot(data=d,aes(x=x,y=y)) + geom_line()## geom_path: Each group consists of only one observation. Do you need to
## adjust the group aesthetic?
ggplot(data=d,aes(x=x,y=y)) + geom_step()## Error in grid.Call.graphics(L_lines, x$x, x$y, index, x$arrow): invalid line type
