[R] Non date value

[Ashta]

DF1 is a data frame.   I am suspecting there might be non date value
in that column. My question is how to  remove  a non date values  from
 that field.
example if Alex152 has  12253,. This value is not a date format.


On Fri, Apr 14, 2017 at 11:24 PM, Bert Gunter <bgunter.4567 at gmail.com> wrote:
> 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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