extracting rows based on column r code example

Example: 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