[Rd] [EXTERNAL] Re: all.equal failure

[Therneau, Terry M., Ph.D.]

Duncan,
   I should have included it in my original note, but

      all.equal(unclass(t0x), unclass(t1x))

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,

Terry



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)
>> [1] TRUE
>>
>> # the above is wrong, because they actually are not the same
>>
>>   > all.equal(attr(t0x, 'dataClasses'), attr(t1x, 'dataClasses'))
>> [1] "Names: 1 string mismatch"
>> [2] "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
>
>  c("terms","formula")
>
> 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
>>
>> locale:
>>    [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
>>    [3] LC_TIME=en_US.UTF-8        LC_COLLATE=C
>>    [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
>>    [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
>>    [9] LC_ADDRESS=C               LC_TELEPHONE=C
>> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods base
>>
>> loaded via a namespace (and not attached):
>> [1] compiler_3.7.0 tools_3.7.0
>>
>>
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>>
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>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>


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