R Notebook

How to set index in the data frame

df<-cars

head(df)

##   speed dist
## 1     4    2
## 2     4   10
## 3     7    4
## 4     7   22
## 5     8   16
## 6     9   10

Set index as letters

row.names(df)<-sample(c(outer(letters,LETTERS,sep="_",paste)),nrow(df))

head(df)

##     speed dist
## f_S     4    2
## l_R     4   10
## t_U     7    4
## w_Y     7   22
## c_C     8   16
## b_K     9   10

Reset the index as number instead of letters

row.names(df)<-1:nrow(df)

head(df)

##   speed dist
## 1     4    2
## 2     4   10
## 3     7    4
## 4     7   22
## 5     8   16
## 6     9   10