[Rcpp-devel] efficient ingestion of "sparse csv"

[Dirk Eddelbuettel]

Vincent,

In the broad terms of the question the best answer may be a simple "sure".
More seriously, there have been many approaches.  Consider for example the
recent Rcpp Gallery post lead by Zach (with some edits by me):
  https://gallery.rcpp.org/articles/sparse-matrix-class/

It's focus on not copying <i,p,x> again if we already have them as R vectors,
which is a fair point. If the goal is to get to SuperLU via (Rcpp)Armadillo
then I do not think you can avoid the (internal) copies.  As always, the
answer may be "it depends".

Hope this helps, happy to refine,  Dirk

-- 
https://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org