[R] Replacing values without looping

[wuffmeister]

I got an array similar to the one below, and want to replace all NAs with the
previous value.
99 8.2 b
NA 8.3 x
NA 7.9 x
98 8.1 b
NA 7.7 x
99 9.3 b
...

i.e. the first two NAs should be replaced to 99, whereas the last one should
be 98.

I would like to apply a function to reach row, checking if the value in col
1 is NA, and if it is, set the value to the previous row's col 1 value.

Haven't been able to do this without looping, which gets very slow for large
datasets...

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