以下是一种方法：

  
 ggplot（data = dd）+ 
 geom_rect（aes（xmax = x + width / 2，xmin = x  -  width / 2，
 ymax = y + height / 2，ymin = y  -  height / 2），
 alpha = 0.2，color = rgb（0,114,178，maxColorValue = 256），
 fill = rgb（0,114,178，maxColorValue = 256） 
 coord_fixed（）+ 
 theme_bw（）

I am plotting a 4 dimensional data set. Beyond the x-axis and y-axis, I want to represent the 3rd and the 4th dimension by rectangles of different width and height. Can I do this with ggplot? Thanks.

Here is one approach:

dd <- data.frame(x = (x <- 1:10), 
                 y = x + rnorm(10), width = runif(10,1,2), height = runif(10,1,2))

ggplot(data = dd) + 
  geom_rect(aes(xmax = x + width/2, xmin = x - width/2, 
                ymax = y + height/2, ymin = y - height/2), 
            alpha =0.2, color = rgb(0,114,178, maxColorValue=256), 
            fill = rgb(0,114,178, maxColorValue=256)) + 
  coord_fixed() + 
  theme_bw()