Here is an example of a data set `df`: 

```
Name    L1     L2     L3    L4
Carl    1       NA     0     2
Carl    0       1     4     1 
Joe     3       0     3     1
Joe     2       2     1     0

```

I would like to create a function that would be able to tally up the number of values in columns L2, L3, and L4 that are greater than 0 as a function of some name. For example:

```
someFunction(Joe)
# 4

```

However, I have some `NA`s in my columns. 

I have tried using `complete.cases` to remove the `NA`s but I do not want to remove the entire row. I want to use `aggregate`, however, I am not exactly sure how. Thanks for your help.