[R] How to locate the difference from two data frames

Charles C. Berry cberry at tajo.ucsd.edu
Thu Apr 8 05:46:19 CEST 2010

On Wed, 7 Apr 2010, Jun Shen wrote:

> Dear all,
> I understand identical (a,b) will tell me if a and b are exactly the same or
> not. But what if they are different, is there anyway to tell which
> element(s) are different? Thanks.

which( a != b, arr.ind = TRUE)


> Jun
> 	[[alternative HTML version deleted]]
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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901

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