This problem has been discussed in various places but I don't see a clear solution. Certain applications are generating large comma-delimited files with mostly zero entries. The aim is to ingest efficiently, converting to sparse representation a record at a time. Presumably a triplet format would be the initial internal representation, with an aim to convert at the end to Matrix dgCmatrix format. Has anyone tackled this in Rcpp or RcppArmadillo?
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