更新时间:2023-02-10 12:57:58
您要查找的是dplyr
完整代码:
library(dplyr)
mtcars %>%
group_by(cyl, gear) %>%
summarise_all("mean")
# Source: local data frame [8 x 11]
# Groups: cyl [?]
#
# cyl gear mpg disp hp drat wt qsec vs am carb
# <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
# 1 4 3 21.500 120.1000 97.0000 3.700000 2.465000 20.0100 1.0 0.00 1.000000
# 2 4 4 26.925 102.6250 76.0000 4.110000 2.378125 19.6125 1.0 0.75 1.500000
# 3 4 5 28.200 107.7000 102.0000 4.100000 1.826500 16.8000 0.5 1.00 2.000000
# 4 6 3 19.750 241.5000 107.5000 2.920000 3.337500 19.8300 1.0 0.00 1.000000
# 5 6 4 19.750 163.8000 116.5000 3.910000 3.093750 17.6700 0.5 0.50 4.000000
# 6 6 5 19.700 145.0000 175.0000 3.620000 2.770000 15.5000 0.0 1.00 6.000000
# 7 8 3 15.050 357.6167 194.1667 3.120833 4.104083 17.1425 0.0 0.00 3.083333
# 8 8 5 15.400 326.0000 299.5000 3.880000 3.370000 14.5500 0.0 1.00 6.000000