Thank you, Dieter, very much for your answer.
I'd rather avoid using mosaic. I think that I need to read more about
"vcd" manual you mentioned. One quick question? Is it possible to
color each cells with all different colors with "mosaicplot"? I have
used "mosaic" function to do coloring each cells depending on my
favor. I mean, I can color any cell with any color with "mosaic" but I
could not figure it out with "mosaicplot." Is it possible to color any
cell with any color with "mosaicplot" function?
I will greatly appreciate any help.
Thank you,
Sang Chul
On May 2, 2008, at 1:41 PM, Dieter Menne wrote:
Sang Chul Choi <Choi <at> biology.rutgers.edu> writes:
I want to have a horizontal line on a mosaic plot with "vcd" package.
This would give me an idea where is 0.5 proportion in a cell. Using
"mosaicplot" function of "graphics" package, I can draw a line using
"abline." But, with "mosaic" function of "vcd" package, I have tried
to use "abline" function, which complains "plot.new has not been
called yet".
Is there a way to draw lines across a mosaic plot?
========================================================
library(vcd)
music = c(210, 194, 170, 110,
190, 406, 730, 290)
dim(music) = c(2, 4)
dimnames(music) = list(Age = c("Old", "Young"),
Education = c("High", "Low", "Upper",
"Lower"))
mosaic(music, keep_aspect_ratio=FALSE)
abline(h=0.5)
Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
plot.new has not been called yet
========================================================
Not that easy. vcd uses grid graphics, which is a medium-to-low
level package;
for example, lattice also uses grid graphics, and abline would not
help.
You could draw directly using grid graphics, but it may be a bit of
reading. Use
the example on the bottom of the strucplot page as a starter, which
changes
color. Also see page 17 of strucplot.pdf in the doc-directory of vcd
for an
example how to draw a frame around a rectangle.
grid.edit("rect:Class=1st,Sex=Male,Age=Adult,Survived=Yes",
gp = gpar(fill = "red"))
Dieter
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