On Mar 7, 2012, at 19:06 , henk harmsen wrote:
> i have a data frame with 2 columns of dates.
> with str(dataframe) i have ensured myself that they were indeed formatted
> as dates.
> one column has NA's in it.
>
> the aim is now to make a third column that chooses date1 if it is a date,
> and c
i have a data frame with 2 columns of dates.
with str(dataframe) i have ensured myself that they were indeed formatted
as dates.
one column has NA's in it.
the aim is now to make a third column that chooses date1 if it is a date,
and choose date2 if it is a NA.
i am trying
df$date3=ifelse(is.na(d
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