如何在不使用 R 中的选项（数字）的情况下设置要为汇总命令打印的位数？
要在不使用的情况下为汇总命令设置要打印的位数options(digits)，我们可以在打印汇总时使用digits参数。-
示例1
使用mtcars数据并查找位数设置为2的汇总统计信息-
summary(mtcars,digits=2)
执行时，上述脚本生成以下内容output(thisoutputwillvaryonyoursystemduetorandomization)-
输出结果
mpg cyl disp hp drat
Min. :10 Min. :4.0 Min. : 71 Min. : 52 Min. :2.8
1st Qu.:15 1st Qu.:4.0 1st Qu.:121 1st Qu.: 96 1st Qu.:3.1
Median :19 Median :6.0 Median :196 Median :123 Median :3.7
Mean :20 Mean :6.2 Mean :231 Mean :147 Mean :3.6
3rd Qu.:23 3rd Qu.:8.0 3rd Qu.:326 3rd Qu.:180 3rd Qu.:3.9
Max. :34 Max. :8.0 Max. :472 Max. :335 Max. :4.9
wt qsec vs am gear
Min. :1.5 Min. :14 Min. :0.00 Min. :0.00 Min. :3.0
1st Qu.:2.6 1st Qu.:17 1st Qu.:0.00 1st Qu.:0.00 1st Qu.:3.0
Median :3.3 Median :18 Median :0.00 Median :0.00 Median :4.0
Mean :3.2 Mean :18 Mean :0.44 Mean :0.41 Mean :3.7
3rd Qu.:3.6 3rd Qu.:19 3rd Qu.:1.00 3rd Qu.:1.00 3rd Qu.:4.0
Max. :5.4 Max. :23 Max. :1.00 Max. :1.00 Max. :5.0
carb
Min. :1.0
1st Qu.:2.0
Median :2.0
Mean :2.8
3rd Qu.:4.0
Max. :8.0示例2
使用mtcars数据并找到位数设置为5的汇总统计信息-
summary(mtcars,digits=5)输出结果
mpg cyl disp hp
Min. :10.400 Min. :4.0000 Min. : 71.10 Min. : 52.00
1st Qu.:15.425 1st Qu.:4.0000 1st Qu.:120.83 1st Qu.: 96.50
Median :19.200 Median :6.0000 Median :196.30 Median :123.00
Mean :20.091 Mean :6.1875 Mean :230.72 Mean :146.69
3rd Qu.:22.800 3rd Qu.:8.0000 3rd Qu.:326.00 3rd Qu.:180.00
Max. :33.900 Max. :8.0000 Max. :472.00 Max. :335.00
drat wt qsec vs
Min. :2.7600 Min. :1.5130 Min. :14.500 Min. :0.0000
1st Qu.:3.0800 1st Qu.:2.5812 1st Qu.:16.892 1st Qu.:0.0000
Median :3.6950 Median :3.3250 Median :17.710 Median :0.0000
Mean :3.5966 Mean :3.2172 Mean :17.849 Mean :0.4375
3rd Qu.:3.9200 3rd Qu.:3.6100 3rd Qu.:18.900 3rd Qu.:1.0000
Max. :4.9300 Max. :5.4240 Max. :22.900 Max. :1.0000
am gear carb
Min. :0.00000 Min. :3.0000 Min. :1.0000
1st Qu.:0.00000 1st Qu.:3.0000 1st Qu.:2.0000
Median :0.00000 Median :4.0000 Median :2.0000
Mean :0.40625 Mean :3.6875 Mean :2.8125
3rd Qu.:1.00000 3rd Qu.:4.0000 3rd Qu.:4.0000
Max. :1.00000 Max. :5.0000 Max. :8.0000示例3
使用mtcars数据并找到位数设置为6的汇总统计信息-
summary(mtcars,digits=6)输出结果
mpg cyl disp hp
Min. :10.4000 Min. :4.0000 Min. : 71.100 Min. : 52.000
1st Qu.:15.4250 1st Qu.:4.0000 1st Qu.:120.825 1st Qu.: 96.500
Median :19.2000 Median :6.0000 Median :196.300 Median :123.000
Mean :20.0906 Mean :6.1875 Mean :230.722 Mean :146.688
3rd Qu.:22.8000 3rd Qu.:8.0000 3rd Qu.:326.000 3rd Qu.:180.000
Max. :33.9000 Max. :8.0000 Max. :472.000 Max. :335.000
drat wt qsec vs
Min. :2.76000 Min. :1.51300 Min. :14.5000 Min. :0.0000
1st Qu.:3.08000 1st Qu.:2.58125 1st Qu.:16.8925 1st Qu.:0.0000
Median :3.69500 Median :3.32500 Median :17.7100 Median :0.0000
Mean :3.59656 Mean :3.21725 Mean :17.8487 Mean :0.4375
3rd Qu.:3.92000 3rd Qu.:3.61000 3rd Qu.:18.9000 3rd Qu.:1.0000
Max. :4.93000 Max. :5.42400 Max. :22.9000 Max. :1.0000
am gear carb
Min. :0.00000 Min. :3.0000 Min. :1.0000
1st Qu.:0.00000 1st Qu.:3.0000 1st Qu.:2.0000
Median :0.00000 Median :4.0000 Median :2.0000
Mean :0.40625 Mean :3.6875 Mean :2.8125
3rd Qu.:1.00000 3rd Qu.:4.0000 3rd Qu.:4.0000
Max. :1.00000 Max. :5.0000 Max. :8.0000示例4
使用mtcars数据并查找位数设置为3的汇总统计信息-
summary(mtcars,digits=3)输出结果
mpg cyl disp hp drat
Min. :10.4 Min. :4.00 Min. : 71.1 Min. : 52.0 Min. :2.76
1st Qu.:15.4 1st Qu.:4.00 1st Qu.:120.8 1st Qu.: 96.5 1st Qu.:3.08
Median :19.2 Median :6.00 Median :196.3 Median :123.0 Median :3.69
Mean :20.1 Mean :6.19 Mean :230.7 Mean :146.7 Mean :3.60
3rd Qu.:22.8 3rd Qu.:8.00 3rd Qu.:326.0 3rd Qu.:180.0 3rd Qu.:3.92
Max. :33.9 Max. :8.00 Max. :472.0 Max. :335.0 Max. :4.93
wt qsec vs am gear
Min. :1.51 Min. :14.5 Min. :0.000 Min. :0.000 Min. :3.00
1st Qu.:2.58 1st Qu.:16.9 1st Qu.:0.000 1st Qu.:0.000 1st Qu.:3.00
Median :3.33 Median :17.7 Median :0.000 Median :0.000 Median :4.00
Mean :3.22 Mean :17.8 Mean :0.438 Mean :0.406 Mean :3.69
3rd Qu.:3.61 3rd Qu.:18.9 3rd Qu.:1.000 3rd Qu.:1.000 3rd Qu.:4.00
Max. :5.42 Max. :22.9 Max. :1.000 Max. :1.000 Max. :5.00
carb
Min. :1.00
1st Qu.:2.00
Median :2.00
Mean :2.81
3rd Qu.:4.00
Max. :8.00