Analogous function for sample_n and sample_frac in dplyr.
sample_n_dt(data, size, replace = FALSE) sample_frac_dt(data, size, replace = FALSE)
| data | data.frame |
|---|---|
| size |
|
| replace | Sample with or without replacement? Default uses |
data.table
sample_n_dt(mtcars, 10)#> 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: 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 #> 3: 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4 #> 4: 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 #> 5: 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 #> 6: 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 #> 7: 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 #> 8: 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 #> 9: 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 #> 10: 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4sample_n_dt(mtcars, 50, replace = TRUE)#> mpg cyl disp hp drat wt qsec vs am gear carb #> 1: 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 #> 2: 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 #> 3: 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 #> 4: 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 #> 5: 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 #> 6: 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 #> 7: 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 #> 8: 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 #> 9: 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 #> 10: 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 #> 11: 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 #> 12: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 13: 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 #> 14: 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 #> 15: 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 #> 16: 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 #> 17: 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 #> 18: 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 #> 19: 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 #> 20: 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 #> 21: 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 #> 22: 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 #> 23: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 24: 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 #> 25: 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 #> 26: 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 #> 27: 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 #> 28: 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 #> 29: 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 #> 30: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 31: 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 #> 32: 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 #> 33: 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 #> 34: 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 #> 35: 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3 #> 36: 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 #> 37: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 38: 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 #> 39: 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 #> 40: 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 #> 41: 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 #> 42: 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 #> 43: 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 #> 44: 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 #> 45: 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 #> 46: 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 #> 47: 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 #> 48: 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 #> 49: 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 #> 50: 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 #> mpg cyl disp hp drat wt qsec vs am gear carbsample_frac_dt(mtcars, 0.1)#> mpg cyl disp hp drat wt qsec vs am gear carb #> 1: 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 #> 2: 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 #> 3: 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4sample_frac_dt(mtcars, 1.5, replace = TRUE)#> mpg cyl disp hp drat wt qsec vs am gear carb #> 1: 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 #> 2: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 3: 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 #> 4: 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4 #> 5: 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 #> 6: 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 #> 7: 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 #> 8: 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 #> 9: 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 #> 10: 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2 #> 11: 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4 #> 12: 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 #> 13: 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 #> 14: 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 #> 15: 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 #> 16: 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 #> 17: 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 #> 18: 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 #> 19: 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 #> 20: 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 #> 21: 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 #> 22: 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 #> 23: 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 #> 24: 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 #> 25: 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 #> 26: 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 #> 27: 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6 #> 28: 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 #> 29: 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 #> 30: 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 #> 31: 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 #> 32: 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 #> 33: 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 #> 34: 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 #> 35: 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 #> 36: 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4 #> 37: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 38: 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 #> 39: 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 #> 40: 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 #> 41: 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 #> 42: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 43: 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 #> 44: 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 #> 45: 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2 #> 46: 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 #> 47: 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 #> 48: 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 #> mpg cyl disp hp drat wt qsec vs am gear carb