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use crate::{
core::prelude::*,
errors::prelude::*,
numeric::prelude::*,
};
/// `ArrayTrait` - Array Rounding functions
pub trait ArrayRounding<N: Numeric> where Self: Sized + Clone {
/// Evenly round to the given number of decimals
///
/// # Arguments
///
/// * `decimals` - Number of decimal places to round to (default: 0). If decimals is negative, it specifies the number of positions to the left of the decimal point
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::flat(vec![2.01, 4.6, 8.0010, 22.234]);
/// assert_eq!(Array::flat(vec![2., 4.6, 8.001, 20.]), arr.round(&Array::flat(vec![0, 1, 3, -1]).unwrap()));
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn round(&self, decimals: &Array<isize>) -> Result<Array<N>, ArrayError>;
/// Evenly round to the given number of decimals. alias on `round`
///
/// # Arguments
///
/// * `decimals` - Number of decimal places to round to (default: 0). If decimals is negative, it specifies the number of positions to the left of the decimal point
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::flat(vec![2.01, 4.6, 8.0010, 22.234]);
/// assert_eq!(Array::flat(vec![2., 4.6, 8.001, 20.]), arr.around(&Array::flat(vec![0, 1, 3, -1]).unwrap()));
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn around(&self, decimals: &Array<isize>) -> Result<Array<N>, ArrayError>;
/// Round elements of the array to the nearest integer
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::flat(vec![2.01, 4.6, 8.0010, 22.234]);
/// assert_eq!(Array::flat(vec![2., 5., 8., 22.]), arr.rint());
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn rint(&self) -> Result<Array<N>, ArrayError>;
/// Round to nearest integer towards zero
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::flat(vec![2.01, 4.6, -1.6, -2.2]);
/// assert_eq!(Array::flat(vec![2., 4., -1., -2.]), arr.fix());
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn fix(&self) -> Result<Array<N>, ArrayError>;
/// Round to nearest integer towards zero
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::flat(vec![2.01, 4.6, -1.6, -2.2]);
/// assert_eq!(Array::flat(vec![2., 4., -1., -2.]), arr.fix());
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn trunc(&self) -> Result<Array<N>, ArrayError>;
/// Return the floor of the input, element-wise
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::flat(vec![2.01, 4.6, -1.6, -2.2]);
/// assert_eq!(Array::flat(vec![2., 4., -2., -3.]), arr.floor());
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn floor(&self) -> Result<Array<N>, ArrayError>;
/// Return the ceil of the input, element-wise
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = Array::flat(vec![2.01, 4.6, -1.6, -2.2]);
/// assert_eq!(Array::flat(vec![3., 5., -1., -2.]), arr.ceil());
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn ceil(&self) -> Result<Array<N>, ArrayError>;
}
impl <N: Numeric> ArrayRounding<N> for Array<N> {
fn round(&self, decimals: &Array<isize>) -> Result<Self, ArrayError> {
let (array, other) = self.broadcast_h2(decimals)?;
let elements = array.clone().into_iter().zip(&other)
.map(|tuple| {
let multiplier = 10_f64.powi(tuple.1.to_i32());
N::from((tuple.0.to_f64() * multiplier).round() / multiplier)
})
.collect();
Self::new(elements, array.get_shape()?)
}
fn around(&self, decimals: &Array<isize>) -> Result<Self, ArrayError> {
self.round(decimals)
}
fn rint(&self) -> Result<Self, ArrayError> {
self.round(&Array::single(0).unwrap())
}
fn fix(&self) -> Result<Self, ArrayError> {
self.map(|i|
if *i >= N::zero() { N::from(i.to_f64().floor()) }
else { N::from(i.to_f64().ceil()) }
)
}
fn trunc(&self) -> Result<Self, ArrayError> {
self.map(|i| N::from(i.to_f64().trunc()))
}
fn floor(&self) -> Result<Self, ArrayError> {
self.map(|i| N::from(i.to_f64().floor()))
}
fn ceil(&self) -> Result<Self, ArrayError> {
self.map(|i| N::from(i.to_f64().ceil()))
}
}
impl <N: Numeric> ArrayRounding<N> for Result<Array<N>, ArrayError> {
fn round(&self, decimals: &Array<isize>) -> Self {
self.clone()?.round(decimals)
}
fn around(&self, decimals: &Array<isize>) -> Self {
self.clone()?.around(decimals)
}
fn rint(&self) -> Self {
self.clone()?.rint()
}
fn fix(&self) -> Self {
self.clone()?.fix()
}
fn trunc(&self) -> Self {
self.clone()?.trunc()
}
fn floor(&self) -> Self {
self.clone()?.floor()
}
fn ceil(&self) -> Self {
self.clone()?.ceil()
}
}