[R] long vectors not supported yet

[Loris Bennett]

Hi Jeff,

Jeff Newmiller <jdnewmil at dcn.davis.ca.us> writes:

>> Hi,
>> 
>> I am running R 3.3.3 and getting the following error:
>> 
>> Error in add_edges(res, edges = t(as.matrix(el[, 1:2])), attr = weight)
>> : 
>>    long vectors not supported yet: ../../src/include/Rinlinedfuns.h:138
>> 
>> when passing a 13 GB TransitionLayer object to shortestPath from the
>> package 'gdistance'.
>> 
>> The error, albeit in a different context, is discussed here:
>> 
>>   https://github.com/tidyverse/readr/issues/309
>>   https://github.com/tidyverse/readr/pull/433
>> 
>> However it is not clear to me quite what the fix was and what kind of
>> limit may still exist in subsequent R versions.
>> 
>> Is this a general problem/issue with R, or is this something more
>> package-specific which should be addressed on R-sig-Geo?

> This looks to me like a package development issue... which may be
> under discussion in R-sig-geo (search the archives), but more likely
> to be appropriate to discuss with the maintainer by email or through
> their development repository (R-forge, though it looks unused).

Thanks for the information.  I reported the issue to the developers of
'igraph', which is where 'add_edges' comes from, here

  https://github.com/igraph/rigraph/issues/255

The response there to the question of whether it is an R core or an
igraph issue was

  R core for sure, but probably both.

Is this indeed the case for R core?  To my naive eye, the error message
suggests more of a known limitation, rather than a bona fide bug.

Cheers,

Loris

-- 
Dr. Loris Bennett (Mr.)
ZEDAT, Freie Universität Berlin         Email loris.bennett at fu-berlin.de