ndarray 0.8.4

An N-dimensional array for general elements and for numerics. Lightweight array views and slicing; views support chunking and splitting.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82


extern crate ndarray;

use ndarray::prelude::*;

#[test]
fn test_from_shape_fn() {
    let step = 3.1;
    let h = Array::from_shape_fn((5, 5),
        |(i, j)| f64::sin(i as f64 / step) * f64::cos(j as f64  / step));
    assert_eq!(h.shape(), &[5, 5]);
}

#[test]
fn test_dimension_zero() {
    let a: Array2<f32> = Array2::from(vec![[], [], []]);
    assert_eq!(vec![0.; 0], a.into_raw_vec());
    let a: Array3<f32> = Array3::from(vec![[[]], [[]], [[]]]);
    assert_eq!(vec![0.; 0], a.into_raw_vec());
}

#[test]
fn test_rc_into_owned() {
    let a = Array2::from_elem((5, 5), 1.).into_shared();
    let mut b = a.clone();
    b.fill(0.);
    let mut c = b.into_owned();
    c.fill(2.);
    // test that they are unshared
    assert!(!a.all_close(&c, 0.01));
}

#[test]
fn test_uninit() {
    unsafe {
        let mut a = Array::<f32, _>::uninitialized((3, 4).f());
        assert_eq!(a.dim(), (3, 4));
        assert_eq!(a.strides(), &[1, 3]);
        let b = Array::<f32, _>::linspace(0., 25., a.len()).into_shape(a.dim()).unwrap();
        a.assign(&b);
        assert_eq!(&a, &b);
        assert_eq!(a.t(), b.t());
    }
}

#[test]
fn deny_wraparound_from_vec() {
    let five = vec![0; 5];
    let five_large = Array::from_shape_vec((3, 7, 29, 36760123, 823996703), five.clone());
    assert!(five_large.is_err());
    let six = Array::from_shape_vec(6, five.clone());
    assert!(six.is_err());
}

#[should_panic]
#[test]
fn deny_wraparound_zeros() {
    //2^64 + 5 = 18446744073709551621 = 3×7×29×36760123×823996703  (5 distinct prime factors)
    let _five_large = Array::<f32, _>::zeros((3, 7, 29, 36760123, 823996703));
}

#[should_panic]
#[test]
fn deny_wraparound_reshape() {
    //2^64 + 5 = 18446744073709551621 = 3×7×29×36760123×823996703  (5 distinct prime factors)
    let five = Array::<f32, _>::zeros(5);
    let _five_large = five.into_shape((3, 7, 29, 36760123, 823996703)).unwrap();
}

#[should_panic]
#[test]
fn deny_wraparound_default() {
    let _five_large = Array::<f32, _>::default((3, 7, 29, 36760123, 823996703));
}

#[should_panic]
#[test]
fn deny_wraparound_uninit() {
    unsafe {
        let _five_large = Array::<f32, _>::uninitialized((3, 7, 29, 36760123, 823996703));
    }
}