[Rd] [EXTERNAL] Re: all.equal failure
Therneau, Terry M., Ph.D.
therne@u @end|ng |rom m@yo@edu
Fri Apr 5 16:19:46 CEST 2019
I should have included it in my original note, but
returns TRUE as well. I had tried that as well. But a further look at all.equal.default
shows the following line right near the top:
if (is.language(target) || is.function(target))
return(all.equal.language(target, current, ...))
and that path explicitly ignores attributes.
I'll change my original original title to "all.equal was not a good tool for testing
certain code issues".
Thanks for the pointer,
On 4/5/19 9:00 AM, Duncan Murdoch wrote:
> On 05/04/2019 9:03 a.m., Therneau, Terry M., Ph.D. via R-devel wrote:
>> This arose in testing [.terms and has me confused.
>> data(esoph) # use a standard data set
>> t0x <- terms(model.frame( ~ tobgp, data=esoph))
>> t1 <- terms(model.frame(ncases ~ agegp + tobgp, data=esoph))
>> t1x <- (delete.response(t1))[-1]
>> > all.equal(t0x, t1x)
>>  TRUE
>> # the above is wrong, because they actually are not the same
>> > all.equal(attr(t0x, 'dataClasses'), attr(t1x, 'dataClasses'))
>>  "Names: 1 string mismatch"
>>  "Lengths (1, 2) differ (string compare on first 1)"
> As documented, all.equal() is generic, with methods for different classes. The classes
> of both t0x and t1x are
> with no all.equal.terms method, so all.equal.formula is called. That method isn't
> specifically documented, but you can see its definition as
> function (target, current, ...)
> if (length(target) != length(current))
> return(paste0("target, current differ in having response: ",
> length(target) == 3L, ", ", length(current) == 3L))
> if (!identical(deparse(target), deparse(current)))
> "formulas differ in contents"
> else TRUE
> So the issue is that deparse(t0x) and deparse(t1x) give the same strings with no
> attributes shown, even though "showAttributes" is set by default. I haven't traced
> through the C code to see where things are going wrong.
> Duncan Murdoch
>> > sessionInfo()
>> R Under development (unstable) (2019-04-05 r76323)
>> Platform: x86_64-pc-linux-gnu (64-bit)
>> Running under: Ubuntu 18.04.2 LTS
>> Matrix products: default
>> BLAS: /usr/local/src/R-devel/lib/libRblas.so
>> LAPACK: /usr/local/src/R-devel/lib/libRlapack.so
>>  LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
>>  LC_TIME=en_US.UTF-8 LC_COLLATE=C
>>  LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
>>  LC_PAPER=en_US.UTF-8 LC_NAME=C
>>  LC_ADDRESS=C LC_TELEPHONE=C
>>  LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>> attached base packages:
>>  stats graphics grDevices utils datasets methods base
>> loaded via a namespace (and not attached):
>>  compiler_3.7.0 tools_3.7.0
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