geom_bar的颜色

Question

我无法控制ggplot

中条形图的颜色

require(mice)
require(ggplot2)
impute <- mice(nhanes, seed = 101)
ldt <-complete(impute,"long", include=TRUE)
ldt$Imputed<-ifelse(ldt$".imp"==0,"Observed","Imputed")

ggplot(ldt[!is.na(ldt$hyp),], aes(x= factor(hyp), colour=Imputed)) + 
  geom_bar() + 
  facet_wrap(~.imp, nrow = 1) +
  scale_y_continuous(expand = c(0,0))

给出了：

但我希望这些酒吧充满了颜色，所以我尝试了：

ggplot(ldt[!is.na(ldt$hyp),], aes(x= factor(hyp))) + 
  geom_bar(colour = Imputed) + 
  facet_wrap(~.imp, nrow = 1) +
  scale_y_continuous(expand = c(0,0))

但这会产生错误：

Error in do.call("layer", list(mapping = mapping, data = data, stat = stat,  : 
  object 'Imputed' not found

Answer 1

首次尝试时使用fill=Imputed代替colour=Imputed。

ggplot(ldt[!is.na(ldt$hyp),], aes(x= factor(hyp), fill=Imputed)) + 
  geom_bar() + 
  facet_wrap(~.imp, nrow = 1) +
  scale_y_continuous(expand = c(0,0))

您可以在fill=Imputed中设置geom_bar，但是您必须将其打包到aes，就像调用ggplot一样。

Answer 2

使用colour = Imputed

而不是在原始美学映射中使用fill = Imputed

ggplot(ldt[!is.na(ldt$hyp),], aes(x= factor(hyp), fill=Imputed)) + 
  geom_bar() + 
  facet_wrap(~.imp, nrow = 1) +
  scale_y_continuous(expand = c(0,0))