[R] Sort a data frame

[Kjetil Halvorsen]

Gabor Grothendieck wrote:

>Gabor Grothendieck <ggrothendieck <at> myway.com> writes:
>
>  
>
>>Liaw, Andy <andy_liaw <at> merck.com> writes:
>>    
>>
>>>Does anyone know how to test whether a
>>>character can be coerced into numeric without generating a warning?
>>>      
>>>
>>   res <- tryCatch(as.numeric(x), warning = function(x)x)
>>
>>res is now numeric if x was successfully converted and is unchanged
>>if it was not.  You can test res using is.numeric and take
>>appropriate action or you can put the action into the body of the
>>warning function such as having it return 0.
>>    
>>
Also:
library(Hmisc)
example(all.is.numeric)

Kjetil Halvorsen


>Sorry.  The above has an error.  It should be:
>
>    # res is x converted to numeric or x without change if that fails
>    res <- tryCatch(as.numeric(x), warning = function(warn)x)
>
>or
>
>    # res is x converted to numeric or 0 if that fails
>    res <- tryCatch(as.numeric(x), warning = function(warn)0)
>
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