我对ggplot2中的facetting有几个问题......
假设我有一个返回如下所示数据的查询:
(请注意,它按Rank asc排序,警报asc和两个警报的等级为3,因为他们的总计=第4周的1798,而Rank是根据第4周的总数设置的)
Rank Week Alarm Total
1 1 BELTWEIGHER HIGH HIGH 1000
1 2 BELTWEIGHER HIGH HIGH 1050
1 3 BELTWEIGHER HIGH HIGH 900
1 4 BELTWEIGHER HIGH HIGH 1800
2 1 MICROWAVE LHS 200
2 2 MICROWAVE LHS 1200
2 3 MICROWAVE LHS 400
2 4 MICROWAVE LHS 1799
3 1 HI PRESS FILTER 2 CLOG SW 1250
3 2 HI PRESS FILTER 2 CLOG SW 1640
3 3 HI PRESS FILTER 2 CLOG SW 1000
3 4 HI PRESS FILTER 2 CLOG SW 1798
3 1 LOW PRESS FILTER 2 CLOG SW 800
3 2 LOW PRESS FILTER 2 CLOG SW 1200
3 3 LOW PRESS FILTER 2 CLOG SW 800
3 4 LOW PRESS FILTER 2 CLOG SW 1798
(下面的重复代码)
Rank = c(rep(1,4),rep(2,4),rep(3,8))
Week = c(rep(1:4,4))
Total = c( 1000,1050,900,1800,
200,1200,400,1799,
1250,1640,1000,1798,
800,1200,800,1798)
Alarm = c(rep("BELTWEIGHER HIGH HIGH",4),
rep("MICROWAVE LHS",4),
rep("HI PRESS FILTER 2 CLOG SW",4),
rep("LOW PRESS FILTER 2 CLOG SW",4))
spark <- data.frame(Rank, Week, Alarm, Total)
现在我这样做了......
s <- ggplot(spark, aes(Week, Total)) +
opts(
panel.background = theme_rect(size = 1, colour = "lightgray"),
panel.grid.major = theme_blank(),
panel.grid.minor = theme_blank(),
axis.line = theme_blank(),
axis.text.x = theme_blank(),
axis.text.y = theme_blank(),
axis.title.x = theme_blank(),
axis.title.y = theme_blank(),
axis.ticks = theme_blank(),
strip.background = theme_blank(),
strip.text.y = theme_text(size = 7, colour = "red", angle = 0)
)
s + facet_grid(Alarm ~ .) + geom_line()
我明白了......
alt text http://img101.imageshack.us/img101/9103/ss20100315112108.png
请注意,它根据警报进行了刻面,并且刻面按字母顺序排列。
两个问题:
alt text http://img17.imageshack.us/img17/6986/ss20100315113243.png
alt text http://img85.imageshack.us/img85/470/ss20100315113529.png
请注意,我不能仅仅考虑Rank,因为ggplot2只能看到3个方面来绘制真正有4种不同警报的地方。
答案 0 :(得分:6)
回答你的第一个问题:你可以简单地重新排序因子级别,使它们不再是按字母顺序排列的,如下所示:
spark$Alarm<-factor(spark$Alarm, levels(spark$Alarm)[c(1,4,2,3)])
对于第二个问题,您可以编写自己的贴标机功能,以便关联警报和等级,例如
lbl.fn <- function(variable, value) { paste(spark$Rank[which(as.character(spark$Alarm)==as.character(value))],as.character(value)) }
s + facet_grid(Alarm ~ ., labeller="lbl.fn") + geom_line()