R- 특정 값이 있는 행만을 추출하고 싶을때

1. 예제 테이블 

> NewTable

# A tibble: 32 x 3
   Pos          name     pos  
   <chr>        <chr>    <fct>
 1 Chr1_100_200 BarcodeD 1    
 2 Chr1_100_200 BarcodeA 1    
 3 Chr1_100_200 BarcodeB .    
 4 Chr1_100_200 BarcodeC 1    
 5 Chr1_200_300 BarcodeD 1    
 6 Chr1_200_300 BarcodeA 1    
 7 Chr1_200_300 BarcodeB .    
 8 Chr1_200_300 BarcodeC .    
 9 Chr1_300_400 BarcodeD 1    
10 Chr1_300_400 BarcodeA 1

2. Pos가 1인 행만을 추출

> NewTable[NewTable$pos ==1,]

# A tibble: 18 x 3
   Pos          name     pos  
   <chr>        <chr>    <fct>
 1 Chr1_100_200 BarcodeD 1    
 2 Chr1_100_200 BarcodeA 1    
 3 Chr1_100_200 BarcodeC 1    
 4 Chr1_200_300 BarcodeD 1    
 5 Chr1_200_300 BarcodeA 1    
 6 Chr1_300_400 BarcodeD 1    
 7 Chr1_300_400 BarcodeA 1    
 8 Chr1_300_400 BarcodeC 1    
 9 Chr1_400_500 BarcodeD 1    
10 Chr1_400_500 BarcodeA 1    
11 Chr1_400_500 BarcodeC 1    
12 Chr2_100_200 BarcodeB 1    
13 Chr2_100_200 BarcodeC 1    
14 Chr2_200_300 BarcodeB 1    
15 Chr2_300_400 BarcodeB 1    
16 Chr2_300_400 BarcodeC 1    
17 Chr2_400_500 BarcodeB 1    
18 Chr2_400_500 BarcodeC 1