HI, The question is meant to be a general one, I am trying to find out if there is new development in R that I might have missed.
but here's a trivial example, To compute y=sin(x) , x = 1,2,... 100000 x=1:100000, 1. y =sin(x) 2. for(i in 1:100000) y=sin(x[i]) 1 is much faster than 2. Old Matlab also had this problem, but in new versions, 1 and 2 are mostly the same. I am just wondering if the same improvement has happened or will happen to R. Thanks . ----- Original Message ----- From: jim holtman <[EMAIL PROTECTED]> Date: Thursday, December 27, 2007 4:39 pm Subject: Re: [R] Efficiency of for-loop in R To: Tong Wang <[EMAIL PROTECTED]> Cc: R help <[EMAIL PROTECTED]> > Exactly "what is the problem you are trying to solve"? Could you > "provide commented, minimal, self-contained, reproducible code"? > > A lot depends on what you are trying to do, There might be other > ways, in R, than a 'for' loop to solve your problems. > > On Dec 27, 2007 6:44 PM, Tong Wang <[EMAIL PROTECTED]> wrote: > > Hi, > > I just realized that in Matlab, as long as memory is pre- > allocated, doing for-loop doesn't cost more time than doing things > in vector form. > > But it seems in R, it still cost a lot to do for-loop. Is > there any improvement in R that I missed. Thanks a lot. > > > > Merry Xmas Everyone ! > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html> and provide commented, minimal, self-contained, > reproducible code. > > > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem you are trying to solve? > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.