R help - Apr 2010 - How to locate the difference from two data frames

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.

Jun

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On Apr 7, 2010, at 9:31 PM, 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.
You could try:

  str(a); str(b)


David Winsemius, MD
West Hartford, CT

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)

HTH,

Chuck
>
> 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