> mtcars
mpg cyl disp hp drat wt qsec vs am
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0
Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0
Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0
Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0
Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0
Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0
Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0
Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0
Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0
Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1
Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0
Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0
AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0
Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0
Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0
Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1
Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1
Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1
Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1
Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1
Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1
Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1
gear carb
Mazda RX4 4 4
Mazda RX4 Wag 4 4
Datsun 710 4 1
Hornet 4 Drive 3 1
Hornet Sportabout 3 2
Valiant 3 1
Duster 360 3 4
Merc 240D 4 2
Merc 230 4 2
Merc 280 4 4
Merc 280C 4 4
Merc 450SE 3 3
Merc 450SL 3 3
Merc 450SLC 3 3
Cadillac Fleetwood 3 4
Lincoln Continental 3 4
Chrysler Imperial 3 4
Fiat 128 4 1
Honda Civic 4 2
Toyota Corolla 4 1
Toyota Corona 3 1
Dodge Challenger 3 2
AMC Javelin 3 2
Camaro Z28 3 4
Pontiac Firebird 3 2
Fiat X1-9 4 1
Porsche 914-2 5 2
Lotus Europa 5 2
Ford Pantera L 5 4
Ferrari Dino 5 6
Maserati Bora 5 8
Volvo 142E 4 2
> mtcars
mpg cyl disp hp drat wt qsec vs am
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0
Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0
Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0
Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0
Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0
Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0
Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0
Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0
Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0
Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1
Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0
Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0
AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0
Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0
Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0
Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1
Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1
Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1
Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1
Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1
Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1
Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1
gear carb
Mazda RX4 4 4
Mazda RX4 Wag 4 4
Datsun 710 4 1
Hornet 4 Drive 3 1
Hornet Sportabout 3 2
Valiant 3 1
Duster 360 3 4
Merc 240D 4 2
Merc 230 4 2
Merc 280 4 4
Merc 280C 4 4
Merc 450SE 3 3
Merc 450SL 3 3
Merc 450SLC 3 3
Cadillac Fleetwood 3 4
Lincoln Continental 3 4
Chrysler Imperial 3 4
Fiat 128 4 1
Honda Civic 4 2
Toyota Corolla 4 1
Toyota Corona 3 1
Dodge Challenger 3 2
AMC Javelin 3 2
Camaro Z28 3 4
Pontiac Firebird 3 2
Fiat X1-9 4 1
Porsche 914-2 5 2
Lotus Europa 5 2
Ford Pantera L 5 4
Ferrari Dino 5 6
Maserati Bora 5 8
Volvo 142E 4 2
> mtcars[order(mtcars$mpg),]#排序所有的列，按照mpg排序
mpg cyl disp hp drat wt qsec vs am
Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0
Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0
Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0
Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0
Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0
Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1
Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0
AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0
Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0
Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1
Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0
Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0
Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0
Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0
Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0
Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0
Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1
Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0
Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1
Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1
Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1
gear carb
Cadillac Fleetwood 3 4
Lincoln Continental 3 4
Camaro Z28 3 4
Duster 360 3 4
Chrysler Imperial 3 4
Maserati Bora 5 8
Merc 450SLC 3 3
AMC Javelin 3 2
Dodge Challenger 3 2
Ford Pantera L 5 4
Merc 450SE 3 3
Merc 450SL 3 3
Merc 280C 4 4
Valiant 3 1
Hornet Sportabout 3 2
Merc 280 4 4
Pontiac Firebird 3 2
Ferrari Dino 5 6
Mazda RX4 4 4
Mazda RX4 Wag 4 4
Hornet 4 Drive 3 1
Volvo 142E 4 2
Toyota Corona 3 1
Datsun 710 4 1
Merc 230 4 2
Merc 240D 4 2
Porsche 914-2 5 2
Fiat X1-9 4 1
Honda Civic 4 2
Lotus Europa 5 2
Fiat 128 4 1
Toyota Corolla 4 1
> mtcars[order(mtcars$mpg),1:3]#按照mpg,排列前三项
mpg cyl disp
Cadillac Fleetwood 10.4 8 472.0
Lincoln Continental 10.4 8 460.0
Camaro Z28 13.3 8 350.0
Duster 360 14.3 8 360.0
Chrysler Imperial 14.7 8 440.0
Maserati Bora 15.0 8 301.0
Merc 450SLC 15.2 8 275.8
AMC Javelin 15.2 8 304.0
Dodge Challenger 15.5 8 318.0
Ford Pantera L 15.8 8 351.0
Merc 450SE 16.4 8 275.8
Merc 450SL 17.3 8 275.8
Merc 280C 17.8 6 167.6
Valiant 18.1 6 225.0
Hornet Sportabout 18.7 8 360.0
Merc 280 19.2 6 167.6
Pontiac Firebird 19.2 8 400.0
Ferrari Dino 19.7 6 145.0
Mazda RX4 21.0 6 160.0
Mazda RX4 Wag 21.0 6 160.0
Hornet 4 Drive 21.4 6 258.0
Volvo 142E 21.4 4 121.0
Toyota Corona 21.5 4 120.1
Datsun 710 22.8 4 108.0
Merc 230 22.8 4 140.8
Merc 240D 24.4 4 146.7
Porsche 914-2 26.0 4 120.3
Fiat X1-9 27.3 4 79.0
Honda Civic 30.4 4 75.7
Lotus Europa 30.4 4 95.1
Fiat 128 32.4 4 78.7
Toyota Corolla 33.9 4 71.1
> mtcars[order(mtcars$mpg,mtcars$cyl),]#mpg数值相同情况下，按照cyl排序(次要关键词)
mpg cyl disp hp drat wt qsec vs am
Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0
Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0
Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0
Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0
Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0
Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1
Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0
AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0
Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0
Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1
Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0
Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0
Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0
Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0
Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0
Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1
Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0
Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0
Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1
Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1
Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1
gear carb
Cadillac Fleetwood 3 4
Lincoln Continental 3 4
Camaro Z28 3 4
Duster 360 3 4
Chrysler Imperial 3 4
Maserati Bora 5 8
Merc 450SLC 3 3
AMC Javelin 3 2
Dodge Challenger 3 2
Ford Pantera L 5 4
Merc 450SE 3 3
Merc 450SL 3 3
Merc 280C 4 4
Valiant 3 1
Hornet Sportabout 3 2
Merc 280 4 4
Pontiac Firebird 3 2
Ferrari Dino 5 6
Mazda RX4 4 4
Mazda RX4 Wag 4 4
Volvo 142E 4 2
Hornet 4 Drive 3 1
Toyota Corona 3 1
Datsun 710 4 1
Merc 230 4 2
Merc 240D 4 2
Porsche 914-2 5 2
Fiat X1-9 4 1
Honda Civic 4 2
Lotus Europa 5 2
Fiat 128 4 1
Toyota Corolla 4 1
> mtcars[order(-mtcars$mpg,mtcars$cyl),]#mpg倒序排列，cyl升序
mpg cyl disp hp drat wt qsec vs am
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1
Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1
Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1
Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0
Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0
Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1
Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1
Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0
Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0
Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0
Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0
Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0
Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1
Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0
Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0
AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0
Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1
Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0
Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0
Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0
Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0
Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0
gear carb
Toyota Corolla 4 1
Fiat 128 4 1
Honda Civic 4 2
Lotus Europa 5 2
Fiat X1-9 4 1
Porsche 914-2 5 2
Merc 240D 4 2
Datsun 710 4 1
Merc 230 4 2
Toyota Corona 3 1
Volvo 142E 4 2
Hornet 4 Drive 3 1
Mazda RX4 4 4
Mazda RX4 Wag 4 4
Ferrari Dino 5 6
Merc 280 4 4
Pontiac Firebird 3 2
Hornet Sportabout 3 2
Valiant 3 1
Merc 280C 4 4
Merc 450SL 3 3
Merc 450SE 3 3
Ford Pantera L 5 4
Dodge Challenger 3 2
Merc 450SLC 3 3
AMC Javelin 3 2
Maserati Bora 5 8
Chrysler Imperial 3 4
Duster 360 3 4
Camaro Z28 3 4
Cadillac Fleetwood 3 4
Lincoln Continental 3 4
> library(dplyr)
> arrange(mtcars,mpg,vs)
mpg cyl disp hp drat wt qsec vs am gear carb
1 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
2 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
3 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
4 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
5 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
6 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
7 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
8 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
10 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
11 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
12 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
13 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
14 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
15 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
16 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
17 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
18 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
19 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
20 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
21 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
22 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
23 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
24 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
25 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
26 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
27 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
28 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
29 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
30 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
31 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
32 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
> arrange(mtcars,-mpg,vs)
mpg cyl disp hp drat wt qsec vs am gear carb
1 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
2 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
3 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
4 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
5 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
6 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
7 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
8 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
9 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
10 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
11 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
12 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
13 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
14 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
15 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
16 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
17 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
18 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
19 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
20 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
21 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
22 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
23 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
24 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
25 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
26 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
27 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
28 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
29 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
30 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
31 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
32 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
> mtcars
mpg cyl disp hp drat wt qsec vs am
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0
Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0
Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0
Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0
Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0
Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0
Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0
Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0
Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0
Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1
Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0
Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0
AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0
Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0
Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0
Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1
Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1
Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1
Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1
Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1
Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1
Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1
gear carb
Mazda RX4 4 4
Mazda RX4 Wag 4 4
Datsun 710 4 1
Hornet 4 Drive 3 1
Hornet Sportabout 3 2
Valiant 3 1
Duster 360 3 4
Merc 240D 4 2
Merc 230 4 2
Merc 280 4 4
Merc 280C 4 4
Merc 450SE 3 3
Merc 450SL 3 3
Merc 450SLC 3 3
Cadillac Fleetwood 3 4
Lincoln Continental 3 4
Chrysler Imperial 3 4
Fiat 128 4 1
Honda Civic 4 2
Toyota Corolla 4 1
Toyota Corona 3 1
Dodge Challenger 3 2
AMC Javelin 3 2
Camaro Z28 3 4
Pontiac Firebird 3 2
Fiat X1-9 4 1
Porsche 914-2 5 2
Lotus Europa 5 2
Ford Pantera L 5 4
Ferrari Dino 5 6
Maserati Bora 5 8
Volvo 142E 4 2
> #选取子集
> #要求mpg大于等于20，并且vs等于0的数据集
> subset(mtcars,mpg>=20 & vs==0)#需要两个等号，一个等号为赋值0，两个为严格等于0
mpg cyl disp hp drat wt qsec vs am gear carb
Mazda RX4 21 6 160.0 110 3.90 2.620 16.46 0 1 4 4
Mazda RX4 Wag 21 6 160.0 110 3.90 2.875 17.02 0 1 4 4
Porsche 914-2 26 4 120.3 91 4.43 2.140 16.70 0 1 5 2
> subset(mtcars,mpg>=20 & vs==0,hp)
hp
Mazda RX4 110
Mazda RX4 Wag 110
Porsche 914-2 91
> a<-subset(mtcars,mpg>=20 & vs==0)
> a
mpg cyl disp hp drat wt qsec vs am gear carb
Mazda RX4 21 6 160.0 110 3.90 2.620 16.46 0 1 4 4
Mazda RX4 Wag 21 6 160.0 110 3.90 2.875 17.02 0 1 4 4
Porsche 914-2 26 4 120.3 91 4.43 2.140 16.70 0 1 5 2
> subset(a,cyl>4,)
mpg cyl disp hp drat wt qsec vs am gear carb
Mazda RX4 21 6 160 110 3.9 2.620 16.46 0 1 4 4
Mazda RX4 Wag 21 6 160 110 3.9 2.875 17.02 0 1 4 4
> filter(mtcars,mpg>=20,vs==0)#==为严格等于
mpg cyl disp hp drat wt qsec vs am gear carb
1 21 6 160.0 110 3.90 2.620 16.46 0 1 4 4
2 21 6 160.0 110 3.90 2.875 17.02 0 1 4 4
3 26 4 120.3 91 4.43 2.140 16.70 0 1 5 2
> #要求mpg大于等于20，或vs等于0的数据集
> filter(mtcars,mpg>=20|vs==0)#==为严格等于,|为或，&为且
mpg cyl disp hp drat wt qsec vs am gear carb
1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
3 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
4 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
5 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
6 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
7 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
8 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
9 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
10 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
11 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
12 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
13 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
14 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
15 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
16 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
17 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
18 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
19 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
20 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
21 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
22 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
23 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
24 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
25 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
26 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
27 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
28 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
29 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
>