I have a data.frame with 4 columns. The first column is `the_day`, from 11/1/15 until 11/30/15. The next 3 have values corresponding to each day based on `amount_raised`. However, some dates are missing because there were no values in the next 3 columns (no money was raised).

For example, 11/3/15 is missing. What I want to do is add a row in between 11/2/15 and 11/4/15 with the date, and zeros in the next 3 columns. So it would read like this:

```
11/3/2015   0    0    0 

```

Do I have to create a vector and then add it into the existing `data.frame`? I feel like there has to be a quicker way.