]> Thanks to you and Basile, who also replied. I think I now understand that I need to use the more low-level alloc() function with the appropriate tag, since there doesn't seem to be a version of alloc_array() suitable for doubles. At the moment my main worry is that I'm allocating new arrays to pass to the function faster than the gc can clean them up... I need to find out about hanging on to allocated values on the C side of things. Thanks, Daniel. On Saturday 11 January 2003 11:20 pm, Artem Prisyznuk wrote: > 11.01.03 22:07:51, Daniel Andor <da209@cam.ac.uk> wrote: > >If I pass a non-array double using copy_double(), it works and I get the > >correct number on the other side. > > > >Any ideas as to where I've gone wrong? > > From Caml manual: > > .... > 18.3.3 > Arrays > > Arrays of integers and pointers are represented like tuples, that is, as > pointers to blocks tagged 0. They are accessed with the Field macro for > reading and the modify function for writing. > > Arrays of floating-point numbers (type float array) have a _special, > unboxed_, more efficient representation. These arrays are represented by > pointers to blocks with tag Double_array_tag. They should be accessed with > the Double_field and Store_double_field macros. .... > > >Thanks, > >Daniel. > >------------------- > >To unsubscribe, mail caml-list-request@inria.fr Archives: > > http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: > > http://caml.inria.fr/FAQ/ Beginner's list: > > http://groups.yahoo.com/group/ocaml_beginners > > ------------------- > To unsubscribe, mail caml-list-request@inria.fr Archives: > http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: > http://caml.inria.fr/FAQ/ Beginner's list: > http://groups.yahoo.com/group/ocaml_beginners ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners