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use ndarray::{Array1, Array2, Array3};
use anyhow::Result;
use crate::hist::{hist1d, hist2d, hist3d};
pub fn prob1d(arr: &Array1<usize>, nbins: usize) -> Result<Array1<f64>> {
let hist = hist1d(arr, nbins)?.mapv(|x| x as f64);
let total = hist.sum();
Ok(hist / total)
}
pub fn prob2d(
arr_a: &Array1<usize>,
arr_b: &Array1<usize>,
nbins_a: usize,
nbins_b: usize) -> Result<Array2<f64>>
{
let hist = hist2d(arr_a, arr_b, nbins_a, nbins_b)?.mapv(|x| x as f64);
let total = hist.sum();
Ok(hist / total)
}
pub fn prob3d(
arr_a: &Array1<usize>,
arr_b: &Array1<usize>,
arr_c: &Array1<usize>,
nbins_a: usize,
nbins_b: usize,
nbins_c: usize) -> Result<Array3<f64>>
{
let hist = hist3d(arr_a, arr_b, arr_c, nbins_a, nbins_b, nbins_c)?.mapv(|x| x as f64);
let total = hist.sum();
Ok(hist / total)
}
#[cfg(test)]
mod testing {
use ndarray::{array, Array1};
use super::{prob1d, prob2d, prob3d};
#[test]
fn test_1d_basic() {
let arr = array![0, 1, 2];
let expected = Array1::from_elem(3, 1.0 / 3.0);
let prob = prob1d(&arr, 3).unwrap();
assert_eq!(prob, expected);
}
#[test]
fn test_1d_missing() {
let arr = array![0, 1, 2];
let mut expected = Array1::from_elem(4, 1.0 / 3.0);
expected[3] = 0.0;
let prob = prob1d(&arr, 4).unwrap();
assert_eq!(prob, expected);
}
#[test]
fn test_2d_basic() {
let arr_a = array![0, 1];
let arr_b = array![0, 1];
let expected = array![
[0.5, 0.0],
[0.0, 0.5]
];
let prob = prob2d(&arr_a, &arr_b, 2, 2).unwrap();
assert_eq!(prob.shape(), &[2, 2]);
assert_eq!(prob, expected);
}
#[test]
fn test_2d_missing() {
let arr_a = array![0, 1];
let arr_b = array![0, 1];
let expected = array![
[0.5, 0.0],
[0.0, 0.5],
[0.0, 0.0]
];
let prob = prob2d(&arr_a, &arr_b, 3, 2).unwrap();
assert_eq!(prob.shape(), &[3, 2]);
assert_eq!(prob, expected);
}
#[test]
fn test_3d_basic() {
let arr_a = array![0, 1];
let arr_b = array![0, 1];
let arr_c = array![0, 1];
let expected = array![
[[0.5, 0.0], [0.0, 0.0]],
[[0.0, 0.0], [0.0, 0.5]]
];
let prob = prob3d(&arr_a, &arr_b, &arr_c, 2, 2, 2).unwrap();
assert_eq!(prob.shape(), &[2, 2, 2]);
assert_eq!(prob, expected);
}
}