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gr1 <- c(0, 5, 15, 20, 30, 40)
gr3 <- c(0, 5, 10, 25, 40, 60, 80)
gr2 <- c(0, 15, 25, 30, 40)
df2<- data.frame (pos = c(gr1, gr2, gr3), group = c(rep(1, length(gr1)),
rep(2, length(gr2)), rep(3, length(gr3))))
df2$cpos <- cumsum (df2$pos)
cx <- ggplot(df2, aes(fill = factor(group), x = cpos))
cx + geom_bar(width = 1, colour = "black", position = "dodge") + coord_polar()

pos , melt() reshape2.
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cx <- ggplot(df2, aes(y = group, x = cpos))
cx + geom_point(aes(color = factor(group))) + coord_polar() + ylim(0,3)
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Edit2
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library(ggplot2)
gr1 <- c(0, 5, 15, 20, 30, 40)
gr3 <- c(0, 5, 10, 25, 40, 60, 80)
gr2 <- c(0, 15, 25, 30, 40)
df2<- data.frame (pos = c(gr1, gr2, gr3), group = c(rep(1, length(gr1)),
rep(2, length(gr2)), rep(3, length(gr3))), y = c(rep(1, length(gr1)),
rep(2, length(gr1)), rep(2, length(gr1))))
df2$cpos <- cumsum (df2$pos)
cx <- ggplot(df2, aes(y = y, x = cpos))
cx + geom_point(aes(color = factor(group)), size = 4) + geom_line(aes(x = c(0,500), y = c(1)), color = "yellow") +
geom_line(aes(x = c(0,500), y = c(2)), color = "blue") + scale_y_continuous(limits=c(0,2), breaks = c(0,1,2)) +
scale_x_continuous(labels = df2$pos, breaks = df2$cpos, limits = c(0,500)) + coord_polar() +
opts(panel.grid.major = theme_line(colour = "grey"),
panel.grid.minor = theme_line(colour = "grey", linetype = "dashed"),
panel.background = theme_rect(colour = "white"))
