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use crate::{
core::prelude::*,
errors::prelude::*,
extensions::prelude::*,
};
/// `ArrayTrait` - Array Search functions
pub trait ArraySearch<T: ArrayElement> where Self: Sized + Clone {
/// Returns the indices of the maximum values along an axis.
///
/// # Arguments
///
/// * `axis` - axis along which to search. if None, array is flattened
/// * `keepdims` - if true, the result will broadcast correctly against the input
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = array!(i32, [[10, 11, 12], [13, 14, 15]]);
/// assert_eq!(array!(usize, [5]), arr.argmax(None, None));
/// let arr = array!(f64, [[f64::NAN, 4.], [2., 3.]]);
/// assert_eq!(array!(usize, [0]), arr.argmax(None, None));
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn argmax(&self, axis: Option<isize>, keepdims: Option<bool>) -> Result<Array<usize>, ArrayError>;
/// Returns the indices of the minimum values along an axis.
///
/// # Arguments
///
/// * `axis` - axis along which to search. if None, array is flattened
/// * `keepdims` - if true, the result will broadcast correctly against the input
///
/// # Examples
///
/// ```
/// use arr_rs::prelude::*;
///
/// let arr = array!(i32, [[10, 11, 12], [13, 14, 15]]);
/// assert_eq!(array!(usize, [0]), arr.argmin(None, None));
/// assert_eq!(array!(usize, [0, 0, 0]), arr.argmin(Some(0), None));
/// assert_eq!(array!(usize, [0, 0]), arr.argmin(Some(1), None));
/// let arr = array!(f64, [[f64::NAN, 4.], [2., 3.]]);
/// assert_eq!(array!(usize, [0]), arr.argmin(None, None));
/// assert_eq!(array!(usize, [0, 1]), arr.argmin(Some(0), None));
/// assert_eq!(array!(usize, [0, 0]), arr.argmin(Some(1), None));
/// ```
///
/// # Errors
///
/// may returns `ArrayError`
fn argmin(&self, axis: Option<isize>, keepdims: Option<bool>) -> Result<Array<usize>, ArrayError>;
}
impl <T: ArrayElement> ArraySearch<T> for Array<T> {
fn argmax(&self, axis: Option<isize>, keepdims: Option<bool>) -> Result<Array<usize>, ArrayError> {
if let Some(axis) = axis {
let axis = self.normalize_axis(axis);
let result = self.apply_along_axis(axis, |arr| arr.argmax(None, keepdims));
if keepdims == Some(true) { result }
else { result.reshape(&self.get_shape()?.remove_at(axis)) }
} else {
if self.is_empty()? { return Err(ArrayError::ParameterError { param: "`array`", message: "cannot be empty" }) }
let result = if let Some(i) = self.get_elements()?.iter().position(ArrayElement::is_nan) { Array::single(i) } else {
let sorted = self.sort(None, Some("quicksort"))?.get_elements()?;
let max_pos = self.get_elements()?.iter().position(|item| item == &sorted[sorted.len() - 1]).unwrap();
Array::single(max_pos)
};
if keepdims == Some(true) { result.atleast(self.ndim()?) }
else { result }
}
}
fn argmin(&self, axis: Option<isize>, keepdims: Option<bool>) -> Result<Array<usize>, ArrayError> {
if let Some(axis) = axis {
let axis = self.normalize_axis(axis);
let result = self.apply_along_axis(axis, |arr| arr.argmin(None, keepdims));
if keepdims == Some(true) { result }
else { result.reshape(&self.get_shape()?.remove_at(axis)) }
} else {
if self.is_empty()? { return Err(ArrayError::ParameterError { param: "`array`", message: "cannot be empty" }) }
let result = if let Some(i) = self.get_elements()?.iter().position(ArrayElement::is_nan) { Array::single(i) } else {
let sorted = self.sort(None, Some("quicksort"))?.get_elements()?;
let max_pos = self.get_elements()?.iter().position(|item| item == &sorted[0]).unwrap();
Array::single(max_pos)
};
if keepdims == Some(true) { result.atleast(self.ndim()?) }
else { result }
}
}
}
impl <T: ArrayElement> ArraySearch<T> for Result<Array<T>, ArrayError> {
fn argmax(&self, axis: Option<isize>, keepdims: Option<bool>) -> Result<Array<usize>, ArrayError> {
self.clone()?.argmax(axis, keepdims)
}
fn argmin(&self, axis: Option<isize>, keepdims: Option<bool>) -> Result<Array<usize>, ArrayError> {
self.clone()?.argmin(axis, keepdims)
}
}