[R] identical applied to data frames

[David Winsemius]

On Apr 6, 2014, at 7:00 AM, Rguy wrote:

> I have two data frames that I believe are identical, yet checking  
> them with
> identical() fails.
>
> Each data frame has two columns named 'pk' and 'newv_f13__bool'. As  
> shown
> below, the columns of the data frames are identical, according to the
> identical() function, yet the data frames themselves are not. How  
> can this
> be?
>
> Browse[1]> identical(shft$pk, shft_mat$pk)
> [1] TRUE
> Browse[1]> identical(shft$newv_f13__bool, shft_mat$newv_f13__bool)
> [1] TRUE
> Browse[1]> identical(shft, shft_mat)
> [1] FALSE

  It could be as simple as having a different column order:

 > df1 <- df4
 > identical(df1,df4)
[1] TRUE
 > df1[] <- df1[rev(names(df1))]
 > identical(df1,df4)
[1] FALSE

>
> I have attached a file in which the two data frames are saved (using  
> the
> save() function).

No attachment. Probably not a text file. Read the general instructions  
page more carefully.

-- 

David Winsemius, MD
Alameda, CA, USA