Hi Everyone. I hope this isn’t a stupid question but I can’t seem to
understand the following
scoping behavior. The basic story is that mesh in the following two
examples behaves differently when defined in global scope vrs within a
function. I’m worried that I’m completely ignorant of how functions work
within other functions. Some help would be much appreciated. Thanks!
In this block of code mesh is defined as a global variable.
julia> mesh(y) = (x = repmat(y.', 2, 1); return x)
mesh (generic function with 1 method)
julia> x = mesh(1:2);
julia> y = mesh(2:3);
julia> x
2x2 Array{Int64,2}:
1 2
1 2
When I quit, restart Julia and define mesh within foo I get a different
answer.
julia> function foo()
mesh(y) = (x = repmat(y.', 2, 1); return x)
x = mesh(1:2)
y = mesh(2:3) # <- this line is necessary to see the effect
return x
end
foo (generic function with 1 method)
julia> x = foo() # <- different than the x in the global case.
2x2 Array{Int64,2}:
2 3
2 3
Here is my version info
julia> versioninfo()
Julia Version 0.4.0-dev+5994
Commit 8efc44d (2015-07-15 15:42 UTC)
Platform Info:
System: Darwin (x86_64-apple-darwin14.4.0)
CPU: Intel(R) Core(TM) M-5Y51 CPU @ 1.10GHz
WORD_SIZE: 64
BLAS: libopenblas (USE64BITINT NO_AFFINITY HASWELL)
LAPACK: libopenblas
LIBM: libopenlibm
LLVM: libLLVM-3.3
