[R] all.equal and names?

[Marc Schwartz]

It is in the Description now (at least for 1.9.1 patched):

all.equal(x,y) is a utility to compare R objects x and y testing `near
equality'. If they are different, comparison is still made to some
extent, and a report of the differences is returned. Don't use all.equal
directly in if expressionsâ"either use identical or combine the two, as
shown in the documentation for identical.

There is also a reference to:

attr.all.equal(target, current, ...)

on the same help page, which returns the following using the example:

> attr.all.equal(1, c(a=1))
[1] "names for current but not for target"

Not quite the same message as S-PLUS however.

HTH,

Marc


On Wed, 2004-08-18 at 11:02, Spencer Graves wrote:
> Hi, Duncan: 
> 
>       Thanks much.  I think I remember reading about both "all.equal" 
> and "identical" in Venables and Ripley (2002) MASS.  Unfortunately, I 
> don't have MASS handy now, and I could not find it otherwise, so I asked. 
> 
>       What needs to happen to upgrade the "all.equal" documentation to 
> add "identical" to the "see also"? 
> 
>       Best Wishes,
>       Spencer
> 
> Duncan Murdoch wrote:
> 
> >On Wed, 18 Aug 2004 10:27:49 -0400, Spencer Graves
> ><spencer.graves at pdf.com> wrote :
> >
> >  
> >
> >>     How can I compare two objects for structure, names, values, etc.?  
> >>With R 1.9.1 under Windows 2000, the obvious choice "all.equal" ignores 
> >>names and compares only values: 
> >>
> >>    
> >>
> >>>all.equal(1, c(a=1))
> >>>      
> >>>
> >>[1] TRUE
> >>
> >>     Under S-Plus 6.2, I get the comparison I expected: 
> >>
> >>    
> >>
> >>>all.equal(1, c(a = 1))
> >>>      
> >>>
> >>[1] "target, current classes differ: integer : 
> >>named"                                                   
> >>[2] "class of target is \"integer\", class of current is \"named\" 
> >>(coercing current to class of target)"
> >>    
> >>
> >
> >If you want the explanation you're out of luck, but identical() does
> >the test:
> >
> >  
> >
> >>identical(1, c(a = 1))
> >>    
> >>
> >[1] FALSE
> >
> >Duncan Murdoch
> >  
> >
> 
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