specify legend position with Date axis

[jakebe...@gmail.com]

I am trying to locate a legend in the upper left corner of a plot.  The x-axis is Date data.  The legend position can be specified using opts(legend.position=c(x,y)), but I'm not sure how to reference Date class information for the x-position.  Below is an example where I converted the Date to numeric, but it fails.

 

df <- data.frame(dates = as.Date(c('2012-05-01', '2012-06-01', '2012-07-01')),
        y = c(1,2,3), groups = factor(c('A', 'B', 'C')))

ggplot(df, aes(dates, y)) + geom_point(aes(shape = groups)) +
  opts(legend.position = c(as.numeric(as.Date('2012-05-01')), 2.75))

 

> sessionInfo()
R version 2.13.1 (2011-07-08)
Platform: i386-pc-mingw32/i386 (32-bit)

ggplot2_0.8.9

 

thanks

Jake

[Ito, Kaori (Groton)]

I am guessing you are trying to do this?

 

ggplot(df, aes(dates, y)) + geom_point(aes(shape = groups)) +

   opts(legend.position = c(0.1, 0.85))

 

The range for the legend position within a plot is 0-1.

--Kaori

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