Re: [R] issues with identical()

From: Jean Eid <jeaneid_at_chass.utoronto.ca>
Date: Sun 22 May 2005 - 02:22:06 EST


Thank you all for pointing out the name of the variables.. I do apologize for not catching that,..

have a good day,

Jean

On Fri, 20 May 2005, Prof Brian Ripley wrote:

> On Fri, 20 May 2005, Jean Eid wrote:
>
> > Hi all, hope you having a nice day,
> >
> > I ahve this weird results with identical (probably I am not understanding
> > correctly what it does ...)
>
> Why should
>
> a data frame with colunns pub_id faminc90
> a data frame with colunns pub_id faminc
>
> be considered identical()? Its description is
>
> The safe and reliable way to test two objects for being _exactly_
> equal.
>
> and those are not equal in a critical way.
>
> > I have these two data frames and I issue :
> >> identical(temp, temp1)
> > [1] FALSE
> >
> >
> > However, these data frames are Nx2 and when I issue:
> >> identical(temp[,2], temp1[,2])
> > [1] TRUE
> >> identical(temp[,1], temp1[,1])
> > [1] TRUE
> >
> > and the results from str
> >
> >
> >> str(temp)
> > `data.frame': 7072 obs. of 2 variables:
> > $ pub_id : int 10000 1000 10001 10002 10003 10004 10005 10006 10007
> > $ faminc90: int -2 5998 19900 43000 35000 40000 56538 61000 36000 39105
> >> str(temp1)
> > `data.frame': 7072 obs. of 2 variables:
> > $ pub_id: int 10000 1000 10001 10002 10003 10004 10005 10006 10007 10008
> > $ faminc: int -2 5998 19900 43000 35000 40000 56538 61000 36000 39105
> >
> > The question is why are the objects different. How else can I tell what is
> > the difference
>
> --
> Brian D. Ripley, ripley@stats.ox.ac.uk
> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
> University of Oxford, Tel: +44 1865 272861 (self)
> 1 South Parks Road, +44 1865 272866 (PA)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
>



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