[R] Non date value

[Bert Gunter]

Show us str(DF1) . It is not a data frame.

-- Bert




On Fri, Apr 14, 2017 at 9:02 PM, Ashta <sewashm at gmail.com> wrote:
> Hi all,
> I am reading  a field data that contains several variables. The sample
> of the data with the first two variables is shown below.  I wanted to
> know the minimum  and maximum recording date   However, I have some
> problem.
>
>
> Name      Rdate     V1 to  V20
> Alex1    01/03/2015
> Alex2    01/03/2014
> Alex3    31/12/2012
> Alex4    15/01/2011
> Alex150  22/01/2010
> Alex151  15/02/2011
>
>
>
> DF1=DF1[!is.na(DF1$Rdate),]
> range(DF1$Rdate, na.rm=TRUE)
>
> Warning message:
> In is.na(DF1$Rdate) :
>   is.na() applied to non-(list or vector) of type 'NULL'
> Error in DF1$Rdate : $ operator is invalid for atomic vectors
> Execution halted
>
> I am expecting the Rdate field should contain  recording dates. I  am
> suspecting there might be a non date  value in that columns. How do I
> remove that row if it is not a date format?
>
>
> Thank you.
>
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