Hi,

If I have a data frame A with the following format:

       Day1          Day2           Day3          Day4
1     1979-11-02  1979-11-03  1979-11-04  <NA>
2     1979-12-06  <NA>          <NA>         <NA>
3     1979-12-13  1979-12-14  1979-12-15  1979-12-16
4     1979-12-20  <NA>          <NA>         <NA>

And a date "1979-12-14", for example.

How can I find the row or rows of the data frame were that date can be
found?

The date is stored in a date format variable called 'day'. I am trying
commands such as A==day, expecting to see a matrix of logical values, but I
am only getting error messages such as "(list) object cannot be coerced to
'double'".

I am looking for a simple command that would return, in this case, a vector:

FALSE FALSE TRUE FALSE

Thanks for any help!

Gonçalo

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