“подмножество строки r” Ответ

подмножество строки r

# df[row,column]

df[1, ]   # select first row and all columns from df
df[ ,8]   # select all rows for column 8 from df
df[2,5]   # select row 2, column 5 from df 
df[1:5, ] # select rows 1 to 5 and all columns from df