Re: [R] how to speed up the inefficient code

Try this -- use matrices instead of dataframes if you want speed: > p<-data.frame(a=rnorm(10),b=rnorm(10),c=rnorm(10),d=rnorm(10)) > test<-data.frame(a=rnorm(1),b=rnorm(1),c=rnorm(1),d=rnorm(1)) > > result<-list() > for(i in 1:nrow(p)){ + result[[i]]<-sum((p[i,]-test)^2) + } > > result_1<-unlist(r

Re: [R] how to speed up the inefficient code

Hi mrzung46, Try cbind(p, result_1 = rowSums((p-c(test))^2)) HTH, Jorge.- On Fri, Mar 16, 2012 at 8:32 AM, mrzung <> wrote: > hi, > > i'm really in trouble to simulate some experiment. > that is, it takes too much time to process the following code. > > following is short example, > > >

[R] how to speed up the inefficient code

hi, i'm really in trouble to simulate some experiment. that is, it takes too much time to process the following code. following is short example, --- p<-data.frame(a=rnorm(10),b=rnorm(10),c=rnor