R help - Jun 2009 - Minor tick marks for date/time ggplot2 (this is better, but not exactly what I want)

library(ggplot2)

melt.updn <- (structure(list(date = structure(c(11808, 11869, 11961, 11992,
12084, 12173, 12265, 12418, 12600, 12631, 12753, 12996, 13057,
13149, 11808, 11869, 11961, 11992, 12084, 12173, 12265, 12418,
12600, 12631, 12753, 12996, 13057, 13149), class = "Date"), site
structure(c(1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("unrestored",
"restored"), class = "factor"), value = c(1.10799962473684,
0.732152347032395,
0.410438861475827, 0.458941230025228, 0.429883166858706, 0.831083728521569,
0.601942073736539, 0.81855597155132, 1.12612228239269, 0.246006569972335,
0.940239233910111, 0.98645360143702, 0.291191536260016, 0.346271105079473,
1.36216149279675, 0.878585508942967, 0.525184260519839, 0.803247305232454,
1.08086182748669, 1.24915815325761, 0.971046497346528, 0.936835411801682,
1.26957337598606, 0.337691543740682, 0.90931142298893, 0.950891472223867,
0.290354002109368, 0.426509990013021)), .Names = c("date",
"site",
"value"), row.names = c(NA, -28L), class = "data.frame"))

#I would also like to add tick marks to this graph is possible with no
label for the months in between the years
qplot(date, value, data=melt.updn, shape=site, ylab="Distance"
,main="Euclidean Distances Time Series",
xlim=c(as.Date("2002-1-1"),
as.Date("2006-3-1")))+geom_line()+theme_bw()+geom_vline(x=as.numeric(as.Date("2002-11-01")))
+ opts(panel.grid.major = theme_line(colour="grey", size=0.75),
panel.grid.minor=theme_line(colour="grey", size=0.25))

thanks
-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis

On Mon, Jun 1, 2009 at 2:18 PM, stephen sefick <ssefick at gmail.com>
wrote:
> library(ggplot2)
>
> melt.updn <- (structure(list(date = structure(c(11808, 11869, 11961,
11992,
> 12084, 12173, 12265, 12418, 12600, 12631, 12753, 12996, 13057,
> 13149, 11808, 11869, 11961, 11992, 12084, 12173, 12265, 12418,
> 12600, 12631, 12753, 12996, 13057, 13149), class = "Date"), site
> structure(c(1L,
> 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L,
> 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label =
c("unrestored",
> "restored"), class = "factor"), value =
c(1.10799962473684, 0.732152347032395,
> 0.410438861475827, 0.458941230025228, 0.429883166858706, 0.831083728521569,
> 0.601942073736539, 0.81855597155132, 1.12612228239269, 0.246006569972335,
> 0.940239233910111, 0.98645360143702, 0.291191536260016, 0.346271105079473,
> 1.36216149279675, 0.878585508942967, 0.525184260519839, 0.803247305232454,
> 1.08086182748669, 1.24915815325761, 0.971046497346528, 0.936835411801682,
> 1.26957337598606, 0.337691543740682, 0.90931142298893, 0.950891472223867,
> 0.290354002109368, 0.426509990013021)), .Names = c("date",
"site",
> "value"), row.names = c(NA, -28L), class =
"data.frame"))
>
> #I would also like to add tick marks to this graph is possible with no
> label for the months in between the years
> qplot(date, value, data=melt.updn, shape=site, ylab="Distance"
> ,main="Euclidean Distances Time Series",
xlim=c(as.Date("2002-1-1"),
>
as.Date("2006-3-1")))+geom_line()+theme_bw()+geom_vline(x=as.numeric(as.Date("2002-11-01")))
> + opts(panel.grid.major = theme_line(colour="grey", size=0.75),
> panel.grid.minor=theme_line(colour="grey", size=0.25))
Unfortunately that's currently not possible - tick marks are always
associated with major grid lines, and more importantly currently
scale_date only lets you specify the time between ticks, not their
labels.  Are the minor monthly grid lines not good enough?

Hadley

-- 
http://had.co.nz/