Hi Felix,
Thanks for your response. That is an interest observation you made about
the println functon.
Upon playing with the code a bit more, I noticed that the strange behaviour
seems to be limited to the function "second". The distinguishing feature of
this function is that it involves a nested function.
I have rewritten the codes to only involve a single function in each source
file (in order to illustrate this better) & the source and results are
below (to call the functions twice just uncomment the last few lines I have
commented out in each program) :
firstAndFirst.rs
1)Call "first" once : 4.5s
2)Call "first" twice : 9.4s
secondAndSecond.rs (nested function call_
1)Call "second" once : 9.5s
2)Call "second" twice : 43.8s (--> I would have expected this to be 19s <--)
*********************************************************************************
*********************************************************************************
//firstAndFirst.rs
static g_r: float = 3.569956;
static g_x0:float = 0.53;
fn first(n: i64, x0 : float, r: float) -> float {
let mut x = x0;
let mut i = 0i64;
loop {
x = r*x*(1.-x);
i += 1;
if i == n { break }
}
x
}
fn main(){
let l = 400000000i64;
let result = first(l,g_x0,g_r);
io::println(float::to_str(result));
//let result2 = first(l,g_x0,g_r);
//io::println(float::to_str(result2));
}
*********************************************************************************
*********************************************************************************
//secondAndSecond.rs
static g_r: float = 3.569956;
static g_x0:float = 0.53;
fn second(n: i64, x0 : float, r: float) -> float {
fn calc(x : float, r: float) -> float {
let mut xm = x;
xm = r*xm*(1.-xm);
xm
}
let mut x = x0;
let mut i = 0i64;
loop {
x = calc(x,r);
i += 1;
if i == n { break }
}
x
}
fn main(){
let l = 400000000i64;
let result = second(l,g_x0,g_r);
io::println(float::to_str(result));
//let result2 = second(l,g_x0,g_r);
//io::println(float::to_str(result2));
}
*********************************************************************************
*********************************************************************************
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