I'm trying to write from a loop to a data frame in R, for example a loop like this>

```
for (i in 1:20) {
print(c(i+i,i*i,i/1))}

```

and to write each line of 3 values to a data frame with three columns, so that each iteration takes on a new row. I've tried using matrix, with ncol=3 and filled by rows, but only get the last item from the loop.

Thanks.