extract elements using columns of dataframe r code example

Example 1: how to extract rows and column of dataframe in r

df[,] #All rows and cols

df[1,] #1st row and all cols

df[1:2,] #First two rows and all cols

df[c(1,3),] #First and third row and all cols

df[1,2:3] #First row and 2nd-3rd col

df[1:2,2:3] #First,second row and Second and third cols

df[,1] #All rows and just first column

#df[,c(1,3)] # all rows and first and third col

Example 2: r - extracting specific columns from a data frame

### Solution 2
library(dplyr)
df %>%
  select(A, B, E)
  
### Solution 2
new_df <- subset(df, select=c("A", "B", "C"))