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//! # spfunc
//! Rust crate for numerical calculation of special functions.
//!
//! [](https://crates.io/crates/spfunc)
//! [](https://docs.rs/spfunc)
//!
//! This crate can calculate each special function for f32, f64, Complex32, Complex64 (from num_complex crate).
//!
//! # Note
//! This crate is still in the development stage and the numerical calculations are not so accurate (especially Hurwitz zeta function).
//!
//! # Functions
//! ## The Gamma Function
//! - The gamma function
//! - The digamma function
//! - The polygamma function
//!
//! ## The Zeta Function
//! - The Riemann zeta function
//! - The Hurwitz zeta function
//!
//! # How to use
//! ```rust
//! use spfunc::gamma::*;
//! use cauchy::{c32, c64};
//!
//! fn main() {
//! println!("Gamma(1.0) = {}", gamma(1.0));
//! println!("ln(Gamma(1.0)) = {}", gamma_ln(1.0));
//!
//! println!("Gamma(1.2+3.4i) = {}", gamma(c32::new(1.2, 3.4)));
//! println!("ln(Gamma(1.2+3.4i)) = {}", gamma_ln(c32::new(1.2, 3.4)));
//!
//! println!("DiGamma(1.2+3.4i) = {}", digamma(c64::new(1.2, 3.4)));
//! println!("TriGamma(1.2+3.4i) = {}", polygamma(c64::new(1.2, 3.4), 1))
//! }
//! ```