[R] dyn.load and c-function
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Tue Oct 8 09:03:22 CEST 2002
"Jeff D. Hamann" <jeff_hamann at hamanndonald.com> writes:
> tf2 <- function( a, b, c )
> .C("testfunc2",
> as.integer(a),
> as.double(b),
> as.integer(c),
> as.double(d) )[[4]]
>
> I get an "Object d not found" error...
>
> how would I write the R part so that I can call my function the way I want
> to?
Your C function assumes that d (or "result" as you call it on the
other side) exists with the relevant length. So you need to create it:
tf2 <- function( a, b, c ){
d <- double(length(a))
.C("testfunc2",
as.integer(a),
as.double(b),
as.integer(c),
d)[[4]]
}
or just
tf2 <- function( a, b, c )
.C("testfunc2",
as.integer(a),
as.double(b),
as.integer(c),
double(length(a)))[[4]]
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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