!!!dplyr
library(dplyr)

!filter()
> ToothGrowth %>% filter(supp=="VC") %>% head()
   len supp dose
1  4.2   VC  0.5
2 11.5   VC  0.5
3  7.3   VC  0.5
4  5.8   VC  0.5
5  6.4   VC  0.5
6 10.0   VC  0.5
> ToothGrowth %>% filter(supp=="OJ") %>% head()
   len supp dose
1 15.2   OJ  0.5
2 21.5   OJ  0.5
3 17.6   OJ  0.5
4  9.7   OJ  0.5
5 14.5   OJ  0.5
6 10.0   OJ  0.5
> ToothGrowth %>% filter(supp!="OJ") %>% head()
   len supp dose
1  4.2   VC  0.5
2 11.5   VC  0.5
3  7.3   VC  0.5
4  5.8   VC  0.5
5  6.4   VC  0.5
6 10.0   VC  0.5
> ToothGrowth %>% filter(dose==1.0) %>% head()
   len supp dose
1 16.5   VC    1
2 16.5   VC    1
3 15.2   VC    1
4 17.3   VC    1
5 22.5   VC    1
6 17.3   VC    1
> ToothGrowth %>% filter(dose>1.0) %>% head()
   len supp dose
1 23.6   VC    2
2 18.5   VC    2
3 33.9   VC    2
4 25.5   VC    2
5 26.4   VC    2
6 32.5   VC    2
> ToothGrowth %>% filter(dose<1.0) %>% head()
   len supp dose
1  4.2   VC  0.5
2 11.5   VC  0.5
3  7.3   VC  0.5
4  5.8   VC  0.5
5  6.4   VC  0.5
6 10.0   VC  0.5




!mutate()
*mutate(付け足すカラム名 = 変換操作)
{{pre
> head(ToothGrowth)
   len supp dose
1  4.2   VC  0.5
2 11.5   VC  0.5
3  7.3   VC  0.5
4  5.8   VC  0.5
5  6.4   VC  0.5
6 10.0   VC  0.5
> ToothGrowth %>% mutate(result = len * dose) %>% head()
   len supp dose result
1  4.2   VC  0.5   2.10
2 11.5   VC  0.5   5.75
3  7.3   VC  0.5   3.65
4  5.8   VC  0.5   2.90
5  6.4   VC  0.5   3.20
6 10.0   VC  0.5   5.00
}}