[−][src]Function arima::util::diff_log
pub fn diff_log<T: Float>(x: &[T]) -> Vec<T>
Returns a n-1 vector containing the pairwise difference of log(x_t) - log(x_t-1).
Arguments
&x
- Reference to input vector slice of length n.
Returns
- Output vector of length n-1.
Example
use arima::util; let x = [1.0, 4.0, 6.0]; let y = util::diff_log(&x); assert!(y[0] - 1.3862944 < 1.0e-7); assert!(y[1] - 0.4054651 < 1.0e-7);