こんにちは、次のグラフを調整して、ゼロ未満の値が赤で塗りつぶされ、上の値が濃い青で塗りつぶされるようにしました。ggplot2でこれを行うにはどうすればよいですか?
mydata = structure(list(Mealtime = "Breakfast", Food = "Rashers", `2002` = 9.12,
`2003` = 9.5, `2004` = 2.04, `2005` = -20.72, `2006` = 18.37,
`2007` = 91.19, `2008` = 94.83, `2009` = 191.96, `2010` = -125.3,
`2011` = -18.56, `2012` = 63.85), .Names = c("Mealtime", "Food", "2002", "2003", "2004", "2005", "2006", "2007", "2008","2009", "2010", "2011", "2012"), row.names = 1L, class = "data.frame")
x=ggplot(mydata) +
aes(x=colnames(mydata)[3:13],y=as.numeric(mydata[1,3:13]),fill=sign(as.numeric(mydata[1,3:13]))) +
geom_bar(stat='identity') + guides(fill=F)
print(x)