[R] Minimum and blanks

[Chris Li]

Thanks Joris and Peter. Sorry for not giving enough details. I have tried
your suggestions and the problem is solved. Thank you. :)


JorisMeys wrote:
> 
> The minimum of a character vector is returned according to the unicode
> or ascii code values, but I guess that's not what Chris is looking
> for.
> 
> Chris, please always try to provide a minimal working example of code
> to see what is wrong.
> 
> Something goes wrong with the input in your example. As Peter
> rightfully pointed out, your vector is considered a character vector.
> So you need to :
> 
> 1) replace "" with NA
>               e.g. x <-  ifelse(x=='',NA,x)
> Better to do something like that when reading in the code.
> 
> 2) use the argument na.rm : min (x, na.rm=T)
> 
> kind regards
> Joris
> 
> On Thu, Oct 1, 2009 at 8:36 AM, Peter Ehlers <ehlers at ucalgary.ca> wrote:
>> Chris,
>>
>> What is your definition of the minimum of a *character* vector?
>>
>>  -Peter Ehlers
>>
>> Chris Li wrote:
>>>
>>> Hi all,
>>>
>>> I want to calculate the minimum of a column which contains blanks.
>>>
>>> R returns "" as the minimum, which is not I want.
>>>
>>> Is there a way to overcome it?
>>>
>>> Thanks in advance.
>>> Chris
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> 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
> 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.
> 
> 

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