将函数应用于dplyr的group_by的输出 [英] applying a function to the output of dplyr's group_by
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问题描述
group_by
结果中的函数的问题。任何提示将不胜感激。 #我想使用基本功能做什么:groupby列中的元素
#并为每个组创建/保存一个情节
(i在级别(iris $ Species)){
df = iris [iris $ Species == i,]
p< ; - ggplot(df,aes(x = Sepal.Length,y = Sepal.Width)+ geom_point())
ggsave(p,filename = paste(i,。pdf,sep =))
}
#我试图用dplyr
库(dplyr)
iris%>%
group_by(Species) %>%
do({
p < - ggplot(。,aes(x = Sepal.Length,y = Sepal.Width)+ geom_point())
ggsave(p,filename = paste(quote(Species),。pdf,sep =))
})
解决方案
嗯,你有一个括号问题和一个文件命名问题,所以也许这是你所指的。我假设
iris%>%
group_by(Species)%>%
({
p< - ggplot(。,aes(x = Sepal.Length,y = Sepal.Width))+ geom_point()
ggsave(p,filename = paste0(unique(。$ Species) ,。pdf))
})
可以解决你的问题。 >
I would like to subset a large dataframe and create a ggplot of each grouping. Sounds like a perfect candidate for dplyr but I'm running into issues calling functions on the group_by
results. Any hints would be greatly appreciated.
# what I want to do using base functions: "groupby" the elements in a column
# and create/save a plot for each group
for (i in levels(iris$Species)){
df = iris[iris$Species == i,]
p <- ggplot(df, aes(x=Sepal.Length, y=Sepal.Width) + geom_point())
ggsave(p, filename=paste(i,".pdf",sep=""))
}
# I'm trying to get something like this using dplyr
library(dplyr)
iris %>%
group_by(Species) %>%
do({
p <- ggplot(., aes(x=Sepal.Length, y=Sepal.Width) + geom_point())
ggsave(p, filename=paste(quote(Species),".pdf",sep=""))
})
解决方案
Well, you have a parenthesis problem and a file naming problem so maybe it's one of those that you are referring to. I'm assuming
iris %>%
group_by(Species) %>%
do({
p <- ggplot(., aes(x=Sepal.Length, y=Sepal.Width)) + geom_point()
ggsave(p, filename=paste0(unique(.$Species),".pdf"))
})
would fix your problem.
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