[R] Non date value

[Ashta]

Jeff,

I am sorry for that.


On Sat, Apr 15, 2017 at 12:04 AM, Jeff Newmiller
<jdnewmil at dcn.davis.ca.us> wrote:
> 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.
>>>>
>>>> ______________________________________________
>>>> 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.
>>
>>______________________________________________
>>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.