我正在尝试更改 ggplot 柱形图上的颜色。谷歌搜索后,我认为以下代码可以工作:
require(ggplot2)
require(RColorBrewer)
State <- c(rep("NSWTC",5), rep("TCV",5), rep("QTC",5),
rep("WATC",5), rep("SAFA",5), rep("Other",5))
Year <- rep(c("11-12","12-13","13-14","14-15","15-16"),6)
##some random data
Funding.Programme <- abs(rnorm(30))
df <- data.frame(State, Year, Funding.Programme)
##this line makes the graph in the order you inputted it, rather than alphabetical
df$State <- factor(df$State, levels=unique(df$State))
##ugly coloured
bars <- ggplot(df) +
aes(x=Year ,y=Funding.Programme, fill=Year) +
geom_bar(stat='identity') +
facet_grid(facets=~State) +
scale_y_continuous('Gross Issuance Requirements')
##nicely coloured
blues <- brewer.pal(5, "Blues")
blues <- rev(blues)
##the following two graphs have the same colours
bars <- ggplot(df) +
aes(x=Year ,y=Funding.Programme, fill=Year) +
geom_bar(stat='identity') +
facet_grid(facets=~State) +
scale_y_continuous('Gross Issuance Requirements') +
scale_fill_brewer(blues)
bars
bars <- ggplot(df) +
aes(x=Year ,y=Funding.Programme, fill=Year) +
geom_bar(stat='identity') +
facet_grid(facets=~State) +
scale_y_continuous('Gross Issuance Requirements') +
scale_fill_brewer(blues.rev)
bars
##and this does not adjust the default colours
bars <- ggplot(df)+
aes(x=Year,y=Funding.Programme, fill=Year) +
geom_bar(stat='identity') +
facet_grid(facets=~State) +
scale_y_continuous('Gross Issuance Requirements') +
scale_colour_manual(values = blues.rev)
bars
但是最后一种方法不起作用,并且生成的倒数第二张和倒数第三张图表是相同的,尽管对象中的颜色顺序颠倒了。