20180811 COSCUP Speaker: 林峻頤 (Iblis Lin)

1. Julia FFI

2. 我們不想放棄原有的 code

3. Calling C
from Julia

4. 還是有很多已存在的
C library

5. `ccall`

6. try out printf from libc

7. Other C Types:
Cstring, Cint, C* ...

8. Other C Types:
Ptr{...}, Ref{...}

9. `ccall` 時有
auto type convert
Base.cconvert
Base.unsafe_convert

10. typeof(Base.cconvt(Cint, 42))
Int32

11. x = Cint[1, 2, 3]
Base.unsafe_convert(Prt{Int64},x)

12. try out custom libfoo
cc -shared -o libfoo.so foo.c

13. Memory Ownership
自己的東西自己 Free

14. 來寫個 swap 看看

15. 比其他語言簡潔的
Glue Code

16. 接 C function 已經很簡單了
但還是存在缺陷

17. C macro 接不出來

18. Other helper: Clang.jl
https://github.com/ihnorton/Clang.jl

19. Calling Python

20. PyCall.jl
https://github.com/JuliaPy/PyCall.jl

21. PyPlot.jl
Pandas.jl
...

22. @pyimport numpy as np

23. @btime np.arange(1,
11)
vs
@btime collect(1:10)

24. py”...”
eval()

25. py”””
import sys
sys.path.append(‘.’)
print(sys.path)
“””
先來改 sys.path

26. py”...”
with interpolation

27. pycall
這個吃 PyObject 的 pointer

28. pybuiltin()
pyprint = pybuiltin(“print”)
@pycall pyprint(“hello pycall”)::Void

29. @pydef
define python class in Julia

30. pyjulia
https://github.com/JuliaPy/pyjulia

31. Current no Py36 support

32. Other Language?

33. RCall.jl
https://github.com/JuliaInterop/RCall.jl

34. MATLAB.jl
https://github.com/JuliaInterop/MATLAB.jl

35. Mathematica.jl
https://github.com/JuliaInterop/Mathematica.jl

36. Q & A