Hi I have the following data frame (Unt):

```
    Day       sunrise   sunset   day.length

1    Monday     6.42    19.97       13.55
2    Monday     6.42    19.97       13.55
3    Monday     6.42    19.97       13.55
4    Monday     6.42    19.97       13.55
5    Monday     6.42    19.97       13.55
6    Monday     6.42    19.97       13.55
7    Monday     6.42    19.97       13.55
8    Friday     6.42    19.97       13.55
9    Friday     6.42    19.97       13.55
10   Friday     6.42    19.97       13.55
11   Saturday       6.42    19.97       13.55
12   Saturday       6.42    19.97       13.55
13   Saturday       6.42    19.97       13.55
14   Saturday       6.42    19.97       13.55
15   Saturday       6.42    19.97       13.55
16   Sunday     6.42    19.97       13.55
17   Sunday     6.42    19.97       13.55
18   Sunday     6.42    19.97       13.55
19   Sunday     6.42    19.97       13.55

```

I am trying to remove the rows with days "Sunday" and "Saturday". I've tried the following

```
    week<-subset(Unt, Day!="Sunday" & Day!="Saturday")

    week<- Unt [!Unt$Day %in% c("Sunday", "Saturday"), ]

```

However in neither case the rows were removed.