[英]Creating a function with column names and ggplot2
我想在使用 ggplot 的自定义函数中传递列名,以便我可以重新创建图形。
错误指出:
Error: All columns in a tibble must be 1d or 2d objects: * Column `x`
如何更新我的函数以便定义我想要的列?
谢谢。
#DATA AND GRAPH
data("USArrests")
USArrests$IsHigh <- ifelse(USArrests[1] >= 13, 1 ,0)
ggplot(USArrests, aes(x=Assault, fill=factor(IsHigh)))+geom_density(alpha=0.25)+
geom_vline(aes(xintercept=mean(Assault[IsHigh==0],na.rm=T)),color="red",linetype="dashed",lwd=1)+
geom_vline(aes(xintercept=mean(Assault[IsHigh==1],na.rm=T)),color="blue",linetype="dashed",lwd=1)+
scale_x_continuous()+
theme_classic()
##ATTEMPT AT FUNCITON
Test <- function(DATA, col1, col2){
ggplot(DATA, aes(x=col1, fill=factor(col2)))+
geom_density(alpha=0.25)+
geom_vline(aes(xintercept=mean(col1[col2==0],na.rm=T)),color="red",linetype="dashed",lwd=1)+
geom_vline(aes(xintercept=mean(col1[col2==1],na.rm=T)),color="blue",linetype="dashed",lwd=1)+
scale_x_continuous()+
theme_classic()
}
#ERROR
Test(USArrests, "Assault", "IsHigh")
首先,在你的参数中有col1
并且在函数体中你调用col
而不是col1
,其次你需要使用get()
来返回命名对象( col1
和col2
)的值。 尝试这个...
Test <- function(DATA, col1, col2){
ggplot(DATA, aes(x=get(col1), fill=factor(get(col2))))+
geom_density(alpha=0.25)+
geom_vline(aes(xintercept=mean(get(col1)[get(col2)==0],na.rm=T)),color="red",linetype="dashed",lwd=1)+
geom_vline(aes(xintercept=mean(get(col1)[get(col2)==1],na.rm=T)),color="blue",linetype="dashed",lwd=1)+
scale_x_continuous()+
xlab(label = "Fixed Acidity Level")+
ggtitle("Distribution of Fixed Acidity Levels")+
theme_classic()
}
Test(USArrests, "Assault", "IsHigh")
如果你不想使用get
那么...
Test <- function(DATA, col1, col2){
col1 <- DATA[,col1]
col2 <- DATA[,col2]
ggplot(DATA, aes(x=col1, fill=factor(col2)))+
geom_density(alpha=0.25)+
geom_vline(aes(xintercept=mean(col1[col2==0],na.rm=T)),color="red",linetype="dashed",lwd=1)+
geom_vline(aes(xintercept=mean(col1[col2==1],na.rm=T)),color="blue",linetype="dashed",lwd=1)+
scale_x_continuous()+
xlab(label = "Fixed Acidity Level")+
ggtitle("Distribution of Fixed Acidity Levels")+
theme_classic()
}
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