[R] Non date value

[Jeff Newmiller]

You don't follow instructions very well. Read the Posting Guide more carefully. 
-- 
Sent from my phone. Please excuse my brevity.

On April 14, 2017 9:39:30 PM PDT, Ashta <sewashm at gmail.com> wrote:
>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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>>> PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>
>______________________________________________
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.