Have a look at `?"%in%"`

.

```
dt[dt$fct %in% vc,]
fct X
1 a 2
3 c 3
5 c 5
7 a 7
9 c 9
10 a 1
12 c 2
14 c 4
```

You could also use `?is.element`

:

```
dt[is.element(dt$fct, vc),]
```

Have a look at `?"%in%"`

.

```
dt[dt$fct %in% vc,]
fct X
1 a 2
3 c 3
5 c 5
7 a 7
9 c 9
10 a 1
12 c 2
14 c 4
```

You could also use `?is.element`

:

```
dt[is.element(dt$fct, vc),]
```