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
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