[R] about interpolating data in r

[lily li]

I have a question about interpolating missing values in a dataframe. The
dataframe is in the following, Column C has no data before 2009-01-05 and
after 2009-12-31, how to interpolate data for the blanks? That is to say,
interpolate linearly between these two gaps using 5.4 and 6.1? Thanks.


df
time                A      B     C
2009-01-01    3      4.5
2009-01-02    4      5
2009-01-03    3.3   6
2009-01-04    4.1   7
2009-01-05    4.4   6.2   5.4
...

2009-11-20    5.1   5.5   6.1
2009-11-21    5.4   4
...
2009-12-31    4.5   6

	[[alternative HTML version deleted]]