Facet_wrap, free_y, scale starting from zero?

[johannes rara]

Hi,

When using facet_wrap and free y axis scale, how to determine that
every scale will have to strart from zero?

E.g. how using this example I can change that every free scale will
start from zero?

library(ggplot2)
p <- qplot(displ, hwy, data = mpg)
p + facet_wrap(~ cyl, scales = "free_y")

-J

[Dennis Murphy]

Hi:

Is this what you had in mind?

p + facet_wrap(~ cyl, scales = "free_y") + expand_limits(x = 0, y = 0)

HTH,
Dennis

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[johannes rara]

Exactly, thanks!

-J

2010/8/5 Dennis Murphy <djm...@gmail.com>:

[Richard Nixon]

Hi,

Looks like the problem was that I was not using the latest version of
ggplot2. The plot behaves as expected under version 0.8.8, and needs
the data set below (data in the original post does not work with
0.8.8).

p <- ggplot(demo.data, aes(x = DATE, y = LINE.TYPE)) +
geom_line() +
geom_point(aes(shape = POINT.TYPE))

p + facet_wrap(~ ID)

demo.data <- structure(list(ID = structure(c(3L, 3L, 4L, 4L, 4L, 4L,
6L, 6L,
6L, 6L, 6L, 6L, 6L, 6L, 1L, 1L, 1L, 1L, 5L, 5L, 8L, 8L, 2L, 2L,
2L, 2L, 7L, 7L, 7L, 7L), .Label = c("0324", "1734", "1790", "6541",
"6717", "6759", "7646", "9898"), class = "factor"), DATE =
structure(c(11565,
11865, 10920, 11220, 10920, 11220, 12005, 13207, 13298, 13598,
12430, 12730, 12005, 13207, 13075, 13375, 13075, 13375, 11955,
12255, 14469, 14769, 14609, 14909, 14609, 14909, 13843, 14143,
13843, 14143), class = "Date"), POINT.TYPE = structure(c(3L,
3L, 3L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 2L, 2L, 3L, 4L, 3L, 3L, 3L,
3L, 2L, 2L, 1L, 1L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L), .Label = c("1",
"2", "3", "4"), class = "factor"), LINE.TYPE = structure(c(4L,
4L, 2L, 2L, 4L, 4L, 1L, 1L, 2L, 2L, 3L, 3L, 4L, 4L, 1L, 1L, 4L,
4L, 2L, 2L, 2L, 2L, 1L, 1L, 4L, 4L, 1L, 1L, 4L, 4L), .Label = c("D",
"C", "B", "A"), class = "factor")), .Names = c("ID", "DATE",
"POINT.TYPE", "LINE.TYPE"), row.names = c(NA, 30L), class =
"data.frame")