How can I use *colSums* for a specific value names?
Let's say I have a data frame with a `Name` column which includes this names: green, red, pink.

I want to use *colSums* only for the rows named 'pink'- this is what I tried to do:

```
colSums(Filter(is.numeric, df$Name=="pink"))

```

I got this error:

> 
> 'x' must be an array of at least two dimensions
> 
> 
>