Function financial::xirr

pub fn xirr<T: TimeZone>(
    values: &[f64], 
    dates: &[DateTime<T>], 
    guess: Option<f64>
) -> Result<f64, &'static str>

Returns the internal rate of return for a schedule of cash flows that is not necessarily periodic

Example

use chrono::{NaiveDate, DateTime, Utc};
let cf = [-379., 100., 100., 100., 100., 100.];
let dates = [
    DateTime::<Utc>::from_utc(NaiveDate::from_ymd(2016, 7, 8).and_hms(0, 0, 0), Utc),
    DateTime::<Utc>::from_utc(NaiveDate::from_ymd(2017, 7, 8).and_hms(0, 0, 0), Utc),
    DateTime::<Utc>::from_utc(NaiveDate::from_ymd(2018, 7, 8).and_hms(0, 0, 0), Utc),
    DateTime::<Utc>::from_utc(NaiveDate::from_ymd(2019, 7, 8).and_hms(0, 0, 0), Utc),
    DateTime::<Utc>::from_utc(NaiveDate::from_ymd(2020, 7, 8).and_hms(0, 0, 0), Utc),
    DateTime::<Utc>::from_utc(NaiveDate::from_ymd(2021, 7, 8).and_hms(0, 0, 0), Utc),
];
assert!((financial::xirr(&cf, &dates, None).unwrap() - 0.10004608364).abs() < 1e-7);