Uhm Converting from one to other copy data? From dataframe to matrix at least?
Em sáb., 30 de abr. de 2022 às 14:26, Jeff Newmiller < jdnew...@dcn.davis.ca.us> escreveu: > A data frame is designed to represent different types in different > columns. A matrix is designed so that all elements are the same. > > It sounds like you need matrices for your algorithm. I would simply > require that... or attempt to convert it immediately and stop if the result > is not numeric. > > On April 30, 2022 10:16:04 AM PDT, Roberto Spadim <robe...@spadim.com.br> > wrote: > >Hi folks! > > > >What's the best pratices to accept a dataframe and numericmatrix in a > function? > > > >Should I have two different methods to deal with NumericMatrix and > DataFrame? > >Could I convert DataFrame to matrix? What's the impact of doing this, > >i.e. does the as.matrix copy dataframe data? > > > >Thanks in advance! > > > >--- > >Today I'm doing something like this: > > > >void RCPP_function(const RObject &vec, const RObject &mat) { > > if(mat.isNULL()) > > Rcpp::stop("mat can't be null"); > > NumericMatrix variable_matrix; > > if (is<NumericMatrix>(mat)) > > variable_matrix = as<NumericMatrix>(mat); > > else > > variable_matrix = Rcpp::internal::convert_using_rfunction(mat, > "as.matrix"); > > > > NumericVector variable_vector; > > if((is<NumericVector>(target) || is<DataFrame>(target)) && > !target.isNULL()){ > > variable_vector=as<NumericVector>(target); > > }else{ > > variable_vector=colMeans(variable_matrix); > > } > > > > ... > > do something with data > > but here it's sure to be: > > NumericVector (variable_vector) > > NumericMatrix (variable_matrix) > > ... > >} > > > > > >-- > >Roberto Spadim > >_______________________________________________ > >Rcpp-devel mailing list > >Rcpp-devel@lists.r-forge.r-project.org > >https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel > -- > Sent from my phone. Please excuse my brevity. > -- Roberto Spadim SPAEmpresarial - Software ERP/Scada Eng. Automação e Controle, Eng. Financeira
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