2013-05-13 119 views
20

我试图用下面的代码为每个配置文件生成一个图表,但我不断收到“至少有一个图层必须包含用于构建切面的所有变量”。错误。我花了几个小时试图让它工作,但我不能。如何在ggplot2中正确使用facet_grid?

我相信anwser一定很简单,任何人都可以帮忙吗?

d = structure(list(category = structure(c(2L, 2L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 3L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 3L, 3L, 3L, 3L, 
3L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L), .Label = c("4X4", 
"HATCH", "SEDAN"), class = "factor"), profile = structure(c(1L, 
1L, 1L, 1L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 
3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 
3L, 3L, 3L, 3L, 3L, 3L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 1L, 
1L), .Label = c("FIXED", "FREE", "MOBILE"), class = "factor"), 
    value = c(6440.32, 6287.22, 9324, 7532, 7287.63, 6827.27, 
    6880.48, 7795.15, 7042.51, 2708.41, 1373.69, 6742.87, 7692.65, 
    7692.65, 8116.56, 7692.65, 7692.65, 7692.65, 7962.65, 8116.56, 
    5691.12, 2434, 8343, 7727.73, 7692.65, 7721.15, 1944.38, 
    6044.23, 8633.65, 7692.65, 7692.65, 8151.65, 7692.65, 7692.65, 
    2708.41, 3271.45, 3333.82, 1257.48, 6223.13, 7692.65, 6955.46, 
    7115.46, 7115.46, 7115.46, 7115.46, 6955.46, 7615.46, 2621.21, 
    2621.21, 445.61)), .Names = c("category", "profile", "value" 
), class = "data.frame", row.names = c(NA, -50L)) 

library(ggplot2) 

p = ggplot(d, aes(x=d$value, fill=d$category)) + geom_density(alpha=.3) 
p + facet_grid(d$profile ~ .) 

回答

34

你的问题来自参照变量明确(即d$profile),而不是相对于在调用ggplotdata说法。任何地方都不需要d$

faceting使用facet_gridfacet_wrap时,您需要这样做。这也是很好的做法在电话做aes

p = ggplot(d, aes(x=value, fill=category)) + geom_density(alpha=.3) 
p + facet_grid(profile ~ .) 

enter image description here

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