Hi,

I would like to change the datatypes of a bunch of variables from character to numeric and was trying to use the following for variables 4 all the way to 21:

```
df <- df%>%
mutate_at(vars(4:21), ~(as.numeric))
```

and I get the following error:

Error: Problem with `mutate()`

input `ACT 2008`

. x Input `ACT 2008`

must be a vector, not a primitive function. i Input `ACT 2008`

is `(structure(function (..., .x = ..1, .y = ..2, . = ..1) ...`

.

Then I tried the following - it doesn't show any error. but the datatype is not changed. Some of the variables start with ACT and some with FC like ACT 2008 and FC 2020:

```
df <- df%>%
mutate_at(vars(contains("ACT|FC")), ~(as.numeric))
```

How can I change several of these variables to numeric?

Thanks for your help!