R包.png

install.packages(“包”)
BiocManager::install(“包”)
library(包)
require(包)
mutate(test, new = Sepal.Length * Sepal.Width)#新增列
select(test,1)#按列序号筛选
select(test, Petal.Length, Petal.Width)#按列名筛选
filter(test, Species == "setosa"&Sepal.Length > 5 )#筛选行
arrange(test, Sepal.Length)#默认从小到大排序
arrange(test, desc(Sepal.Length))#用desc从大到小
summarise(test, mean(Sepal.Length), sd(Sepal.Length))# 计算Sepal.Length的平均值和标准差
# 先按照Species分组，计算每组Sepal.Length的平均值和标准差
group_by(test, Species)
summarise(group_by(test, Species),mean(Sepal.Length), sd(Sepal.Length))

test %>% 
  group_by(Species) %>% 
  summarise(mean(Sepal.Length), sd(Sepal.Length))
count(test,Species)#统计某列的unique值