>From the manual
Argument Passing Behavior: ...means that values are not copied when they
are passed to functions. ...Modifications to mutable values (such as
Arrays) made within a function will be visible to the caller.
I get
julia> function f(x)
x=x+1
y=x+1
end
f (generic function with 1 method)
julia> x=[1:5]'
1x5 Array{Int64,2}:
1 2 3 4 5
julia> y=f(x)
1x5 Array{Int64,2}:
3 4 5 6 7
julia> x
1x5 Array{Int64,2}:
1 2 3 4 5
Apparently Array x is copied inside the function, at least in this case,
and this is not visible to the caller (here made indirectly visible). The
manual is confusing for me. And what is the difference between my example
and the double! function from the manuals style guide, which does actually
modify the function argument?
