On Apr 4, 2010, at 4:18 PM, Marshall Feldman wrote:
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)
)
I have an allergy to naming data objects with names that apply to R
functions so I used df1 as the object name. I have not taken the time
to learn ggplot but here is a base graphics attempt:
plot(NULL , xlim=c(min(df1$xmin), max(df1$xmax)),
ylim=c(min(df1$ymin), max(df1$ymax)) ) # sets up blank plot
with(df1, rect(xmin, ymin, xmax, ymax) )
--
David.
>
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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David Winsemius, MD
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