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
83
84
85
86

use format::packed::Variant;
use format::{Conventional, Packed};
use Element;

impl<'l, T: Element> From<&'l Packed<T>> for Conventional<T> {
    fn from(matrix: &'l Packed<T>) -> Self {
        let &Packed {
            size,
            variant,
            ref values,
        } = validate!(matrix);
        let mut matrix = Conventional::new(size);
        match variant {
            Variant::Lower => {
                let mut k = 0;
                for j in 0..size {
                    for i in j..size {
                        matrix.values[j * size + i] = values[k];
                        k += 1;
                    }
                }
            }
            Variant::Upper => {
                let mut k = 0;
                for j in 0..size {
                    for i in 0..(j + 1) {
                        matrix.values[j * size + i] = values[k];
                        k += 1;
                    }
                }
            }
        }
        matrix
    }
}

impl<T: Element> From<Packed<T>> for Conventional<T> {
    #[inline]
    fn from(matrix: Packed<T>) -> Self {
        (&matrix).into()
    }
}

#[cfg(test)]
mod tests {
    use format::packed::Variant;
    use prelude::*;

    #[test]
    fn into_conventional_lower() {
        let matrix = new!(
            4,
            Variant::Lower,
            vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0]
        );
        let matrix = Conventional::from(matrix);
        assert_eq!(
            &*matrix,
            &*matrix![
                1.0, 0.0, 0.0,  0.0;
                2.0, 5.0, 0.0,  0.0;
                3.0, 6.0, 8.0,  0.0;
                4.0, 7.0, 9.0, 10.0;
            ]
        );
    }

    #[test]
    fn into_conventional_upper() {
        let matrix = new!(
            4,
            Variant::Upper,
            vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0]
        );
        let matrix = Conventional::from(matrix);
        assert_eq!(
            &*matrix,
            &*matrix![
                1.0, 2.0, 4.0,  7.0;
                0.0, 3.0, 5.0,  8.0;
                0.0, 0.0, 6.0,  9.0;
                0.0, 0.0, 0.0, 10.0;
            ]
        );
    }
}