Function financial::xnpv

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

Returns the net present value for a schedule of cash flows that is not necessarily periodic.

Example

use chrono::{NaiveDate, DateTime, Utc, Duration};
let cf = [-500., 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_eq!(financial::xnpv(0.1, &cf, &dates).unwrap(), -120.9553674519204);