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#![feature(non_ascii_idents)] | |
use std::io::{Write, BufRead, BufReader}; | |
use std::process::exit; | |
use std::fs::File; | |
fn main() { | |
let args : Vec<_> = std::env::args().collect(); | |
if args.len() != 2 { | |
writeln!(std::io::stderr(), "Usage: {} FILE", args[0]).unwrap(); | |
exit(1); | |
} | |
let reader = BufReader::new(File::open(&args[1]).unwrap()); | |
let log_pops : Vec<f32> = | |
reader.lines().map(Result::unwrap) | |
.map(|ref line| line.parse::<u32>().unwrap()) | |
.map(|pop| f32::ln(pop as f32)).collect(); | |
let n = log_pops.len() as f32; | |
let mut x̅ : f32 = 0.0; | |
let mut y̅ : f32 = 0.0; | |
let mut s̅q̅r̅x̅ : f32 = 0.0; | |
let mut s̅q̅r̅y̅ : f32 = 0.0; | |
let mut x̅y̅ : f32 = 0.0; | |
for (&x, y) in log_pops.iter().zip((1..log_pops.len()).map(|i| f32::ln(i as f32))) { | |
x̅ += x; | |
s̅q̅r̅x̅ += x * x; | |
y̅ += y; | |
s̅q̅r̅y̅ += y * y; | |
x̅y̅ += x * y; | |
} | |
x̅ /= n; | |
y̅ /= n; | |
s̅q̅r̅x̅ /= n; | |
s̅q̅r̅y̅ /= n; | |
x̅y̅ /= n; | |
let m = (x̅y̅ - x̅ * y̅) / (s̅q̅r̅x̅ - x̅ * x̅); | |
let sqr_r = (x̅y̅ - x̅ * y̅) * (x̅y̅ - x̅ * y̅) / ((s̅q̅r̅x̅ - x̅ * x̅) * (s̅q̅r̅y̅ - y̅ * y̅)); | |
println!("m: {}", m); | |
println!("R²: {}", sqr_r); | |
} |
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