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result_r
2012 Mar 16
2
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,
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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))
2010 Oct 27
2
must .Call C functions return SEXP?
For using R's .Call interface to C functions, all the examples I've
seen have the C function return type SEXP. Why? What does R actually
do with this return type? What happens if I *don't* return a SEXP?
Reason I ask, is I've written some R code which allocates two long
lists, and then calls a C function with .Call. My C code writes to
those two pre-allocated lists, thus, I