Hi there, A couple of days ago I included this comment on a Stackoverflow question about "too large" matrices in RcppArmadillo I wonder if we can use this in a package. After trying to compile the package with and without PKG_CXXFLAGS=-DARMA_64BIT_WORD I'm still not able to create sparse matrices bigger than 65,535 x 65,535. I've realized that the RcppArmadilloConfig.h (version 0.6.600.4.0) file has ARMA_32BIT_WORD 1 so it actually prevents using ARMA_64BIT_WORD (I think?). Any way I can solve this, or I just have to deal with R (3.2.4 Revised (2016-03-16 r70336)) not been able to handle 64INT?
http://stackoverflow.com/questions/16159174/large-spmat-object-with-rcpparmadillo For which Dirk answered: Try locally setting ARMA_64BIT_WORD (check how) -- I can't at the package level as it breaks existing code. It will likely help you. If you set it before the #include <RcppArmadillo.h> things may just work. That at least is the pln. (And you should have asked on rcpp-devel to get more than two eyeballs on this...) And yes the other answer basically says the same thing. – Dirk Eddelbuettel 2 days ago Now I'm asking again but on rcpp-devel =). The issue is that I'm concerned on the part that Dirk says that "things may just work". I was reading about R not been able to handle int64 and its implications for big matrices, and so I'm a little concerned that if passing ARMA_64BIT_WORD works I may loose some information on the way. For example, if I allow a users creating and manipulating 1e6 x 1e6 sparse matrices, is there any chance for them to loose information? Thanks, George G. Vega Yon +1 (626) 381 8171 http://www.its.caltech.edu/~gvegayon/
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