Function papr_db 

pub fn papr_db(x: &[C64]) -> f64

Peak-to-average power ratio max|x|² / mean|x|² in dB (-inf for an empty or zero block).

Examples

use comnum_math::{papr_db, C64};
let x = [C64::new(2.0, 0.0), C64::new(0.0, 0.0)];
assert!((papr_db(&x) - 10.0 * 2f64.log10()).abs() < 1e-12);   // peak 4, mean 2