Hi R fans,

As a newbie following the five-hour rule (after hitting my head against 
the wall for five hours, post to this list), I am appealing for some 
help understanding geom_rect() in ggplot2.

What I want to do is very simple. I want to generate a plot of 
rectangles. Each one represents a business cycle. The x-values will be 
pairs representing the start and end of each cycle. The y-values 
represent the duration of the cycle (in months). In other words, all 
rectangles have coordinates (start, duration) and (end, duration).
rr
I've spent hours trying to figure out the documentation and pouring over 
Google and RSeek searches and am at an impasse. The documentation refers 
to xmin, xmax, ymin, and ymax but doesn't say anything about them. The 
only example gives them both as vectors, so I assume they refer to a 
sequence of coordinates in which each rectangle's vertices is given by 
(xmin[i],ymin[i]), (xmin[i],ymax[i]), (xmax[i],ymax[i]), and 
(xmax[i],ymin[i]). But when I try to plot something simple using this 
understanding,  I get a blank plot.

Here's my code:

    df <- data.frame(
             xmin = c(1,5),
             xmax = c(2,7),
             ymin = c(0,3),
             ymax = c(2,5)
             )
    ggplot(df, aes(xmin = xmin, xmax = xmax, ymin = ymin, ymax = ymin)) +
             geom_rect(fill="grey80")

Please help me before I Google again! :-)

Thanks.

    Marsh Feldman


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