I have now tried to go back to the basic example in the documentation by
calling a single valued function sigmoid from module NumericFuns using
jl_eval_string with no success. The code snippet below calling
Base.sqrt(2.0) works as anticipated, but the snippet calling
NumericFuns.sigmoid(0.0) ends
It seems that your suggestion using ccall from within julia to play around
with the c-api provides some info. Running your ccall command on a couple
of External Packages, i.e. DSP and HDF5 returns the Null pointer.
pkg_ptr = ccall(:jl_eval_string,Ptr{Void},(Ptr{Cchar},),DSP.Pkg.hanning)
julia cval(x) = ccall(:jl_eval_string, Ptr{Void}, (Ptr{Cchar},), x)
cval (generic function with 1 method)
julia cval(using DSP)
Ptr{Void} @0x034bc280
julia cval(DSP.hanning)
Ptr{Void} @0x306408a0
julia hanning = unsafe_pointer_to_objref(ptr)
hanning (generic function with 1
Isaiah,
Thank you so much for this. This really help and hopefully I can move on
making some progress...
Einar
On Tue, Sep 9, 2014 at 4:06 PM, Isaiah Norton isaiah.nor...@gmail.com
wrote:
julia cval(x) = ccall(:jl_eval_string, Ptr{Void}, (Ptr{Cchar},), x)
cval (generic function with 1
Sorry, I'm a bit slow. How do I look up a binding for a specific module? In
other words, how would I explicitly get to call the fftfreq function in
the DSP module from C/C++?
Is this this documented anywhere in Julia docs?
Thanks,
Einar
On Wednesday, September 3, 2014 3:10:59 PM UTC+2,
Sorry, the function is obviously called jl_symbol, not jl_sym
On Friday, September 5, 2014 11:15:16 AM UTC+2, Ivar Nesje wrote:
I would guess that something like
module = jl_eval_global_var
https://github.com/JuliaLang/julia/blob/6277015ee3d46f20149136d092525bec95b6e29d/src/julia.h#L917
I would guess that something like
module = jl_eval_global_var
https://github.com/JuliaLang/julia/blob/6277015ee3d46f20149136d092525bec95b6e29d/src/julia.h#L917
(jl_main_module, jl_sym
https://github.com/JuliaLang/julia/blob/6277015ee3d46f20149136d092525bec95b6e29d/src/julia.h#L666
(MyModule))
Thank you for your help on this. It seems that the 'jl_eval_global_var'
function is local as I got the error undefined reference to
`jl_eval_global_var' when linking. I replaced
your suggestion with:
jl_module_t* jl_dsp_module = (jl_module_t*)
jl_get_binding(jl_main_module, jl_symbol(DSP));
It's jl_eval_string located in jl_api.c in src.
so you would do
jl_value_t * func2 = jl_eval_string(DSP.hanning)
The best way to play around with Julia's c-api is within julia itself.
julia pkg_ptr = ccall(:jl_eval_string, Ptr{Void}, (Ptr{Cchar},),
Base.Pkg.clone)
Ptr{Void} @0x7fd11c1754a0
Yes, Jakes suggestion looks good. When I wrote the embedding doku I also
played around with several internal functions and it turned out that
jl_eval_string is very versatile and can be used in various circumstances.
Einar: Would be great if you could test it and improve the embedding
I'm happy to help out.
Einar
On Fri, Sep 5, 2014 at 7:23 PM, Tobias Knopp tobias.kn...@googlemail.com
wrote:
Yes, Jakes suggestion looks good. When I wrote the embedding doku I also
played around with several internal functions and it turned out that
jl_eval_string is very versatile and
Dear experts,
I've looking at the documentation Embedding Julia
(http://julia.readthedocs.org/en/latest/manual/embedding/) to figure out
how I can call my own julia functions from within C, and I'm struggling to
figure out how I should define the jl_module_t that corresponds the module
I've
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