I'm a little puzzled by your question. Could you use a reference instead of instantiating a new copy?
On Tue, Feb 19, 2013 at 3:19 PM, Ken Williams <ken.willi...@windlogics.com>wrote: > > > > -----Original Message----- > > From: Yan Zhou [mailto:zhou...@me.com] > > Sent: Tuesday, February 19, 2013 5:10 PM > > To: Dirk Eddelbuettel > > Cc: Ken Williams; rcpp-devel@lists.r-forge.r-project.org > > Subject: Re: [Rcpp-devel] Efficient DataFrame access by row & column > > > > The most inefficient part I see is the creation of a new NumericVector > inside > > the inner most loop. You copied each column n times, of which n-1 times > are > > unnecessary. > > That's what I suspected. So is there no way to access elements of a > DataFrame without copying columns to a new vector first? > > -Ken > > ________________________________ > > CONFIDENTIALITY NOTICE: This e-mail message is for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. Any unauthorized review, use, disclosure or distribution of > any kind is strictly prohibited. If you are not the intended recipient, > please contact the sender via reply e-mail and destroy all copies of the > original message. Thank you. > _______________________________________________ > 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 >
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