write down,forget
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分类 Category : R

R矩阵及数据框操作

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R数据框操作,添加一列,并实现分组统计

rbind,基于行,cbind,基于列
矩阵合并(矩阵只能存数字,如果列为非数字,会自动处理)

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R常用命令

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R常用命令(Medcl专用精简版)

1.查看base包命令
library(help=”base”)

2.查看帮助
?lm
help(“*”)
help(“mean”)
help(“bs”, package = “splines”) #在特定包里搜索
help(“bs”,try.all.packages=TRUE) #在所有包中搜索,默认只在内存加载的包中搜索
help.start()
help.search(“tree”)
help.search(“tree”, rebuild = TRUE)) #新安装包之后,需要rebuild
apropos(“length”)  #查找函数

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