mathhook-core 0.2.0

Core mathematical engine for MathHook - expressions, algebra, and solving
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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243

use crate::core::matrix::numeric_matrix::NumericMatrix;
use crate::error::MathError;
use std::ops::{Add, Mul, Neg, Sub};

impl NumericMatrix {
    pub fn add(&self, other: &Self) -> Result<Self, MathError> {
        if self.rows != other.rows || self.cols != other.cols {
            return Err(MathError::DomainError {
                operation: "NumericMatrix::add".to_string(),
                value: crate::Expression::integer(0),
                reason: format!(
                    "Cannot add matrices with different dimensions: {}x{} and {}x{}",
                    self.rows, self.cols, other.rows, other.cols
                ),
            });
        }

        let data: Vec<f64> = self
            .data
            .iter()
            .zip(other.data.iter())
            .map(|(a, b)| a + b)
            .collect();

        Ok(Self {
            rows: self.rows,
            cols: self.cols,
            data,
        })
    }

    pub fn sub(&self, other: &Self) -> Result<Self, MathError> {
        if self.rows != other.rows || self.cols != other.cols {
            return Err(MathError::DomainError {
                operation: "NumericMatrix::sub".to_string(),
                value: crate::Expression::integer(0),
                reason: format!(
                    "Cannot subtract matrices with different dimensions: {}x{} and {}x{}",
                    self.rows, self.cols, other.rows, other.cols
                ),
            });
        }

        let data: Vec<f64> = self
            .data
            .iter()
            .zip(other.data.iter())
            .map(|(a, b)| a - b)
            .collect();

        Ok(Self {
            rows: self.rows,
            cols: self.cols,
            data,
        })
    }

    pub fn scalar_mul(&self, scalar: f64) -> Self {
        let data: Vec<f64> = self.data.iter().map(|x| x * scalar).collect();
        Self {
            rows: self.rows,
            cols: self.cols,
            data,
        }
    }

    pub fn negate(&self) -> Self {
        let data: Vec<f64> = self.data.iter().map(|x| -x).collect();
        Self {
            rows: self.rows,
            cols: self.cols,
            data,
        }
    }
}

impl Add for NumericMatrix {
    type Output = Result<Self, MathError>;

    fn add(self, other: Self) -> Self::Output {
        NumericMatrix::add(&self, &other)
    }
}

impl Add for &NumericMatrix {
    type Output = Result<NumericMatrix, MathError>;

    fn add(self, other: Self) -> Self::Output {
        NumericMatrix::add(self, other)
    }
}

impl Sub for NumericMatrix {
    type Output = Result<Self, MathError>;

    fn sub(self, other: Self) -> Self::Output {
        NumericMatrix::sub(&self, &other)
    }
}

impl Sub for &NumericMatrix {
    type Output = Result<NumericMatrix, MathError>;

    fn sub(self, other: Self) -> Self::Output {
        NumericMatrix::sub(self, other)
    }
}

impl Mul<f64> for NumericMatrix {
    type Output = Self;

    fn mul(self, scalar: f64) -> Self::Output {
        self.scalar_mul(scalar)
    }
}

impl Mul<f64> for &NumericMatrix {
    type Output = NumericMatrix;

    fn mul(self, scalar: f64) -> Self::Output {
        self.scalar_mul(scalar)
    }
}

impl Mul<NumericMatrix> for f64 {
    type Output = NumericMatrix;

    fn mul(self, matrix: NumericMatrix) -> Self::Output {
        matrix.scalar_mul(self)
    }
}

impl Mul<&NumericMatrix> for f64 {
    type Output = NumericMatrix;

    fn mul(self, matrix: &NumericMatrix) -> Self::Output {
        matrix.scalar_mul(self)
    }
}

impl Neg for NumericMatrix {
    type Output = Self;

    fn neg(self) -> Self::Output {
        self.negate()
    }
}

impl Neg for &NumericMatrix {
    type Output = NumericMatrix;

    fn neg(self) -> Self::Output {
        self.negate()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_add_method() {
        let a = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let b = NumericMatrix::from_flat(2, 2, vec![5.0, 6.0, 7.0, 8.0]).unwrap();
        let c = NumericMatrix::add(&a, &b).unwrap();
        assert_eq!(c.get(0, 0).unwrap(), 6.0);
        assert_eq!(c.get(0, 1).unwrap(), 8.0);
        assert_eq!(c.get(1, 0).unwrap(), 10.0);
        assert_eq!(c.get(1, 1).unwrap(), 12.0);
    }

    #[test]
    fn test_sub_method() {
        let a = NumericMatrix::from_flat(2, 2, vec![5.0, 6.0, 7.0, 8.0]).unwrap();
        let b = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let c = NumericMatrix::sub(&a, &b).unwrap();
        assert_eq!(c.get(0, 0).unwrap(), 4.0);
        assert_eq!(c.get(0, 1).unwrap(), 4.0);
        assert_eq!(c.get(1, 0).unwrap(), 4.0);
        assert_eq!(c.get(1, 1).unwrap(), 4.0);
    }

    #[test]
    fn test_scalar_mul() {
        let a = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let b = a.scalar_mul(2.0);
        assert_eq!(b.get(0, 0).unwrap(), 2.0);
        assert_eq!(b.get(0, 1).unwrap(), 4.0);
        assert_eq!(b.get(1, 0).unwrap(), 6.0);
        assert_eq!(b.get(1, 1).unwrap(), 8.0);
    }

    #[test]
    fn test_negate() {
        let a = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let b = a.negate();
        assert_eq!(b.get(0, 0).unwrap(), -1.0);
        assert_eq!(b.get(0, 1).unwrap(), -2.0);
        assert_eq!(b.get(1, 0).unwrap(), -3.0);
        assert_eq!(b.get(1, 1).unwrap(), -4.0);
    }

    #[test]
    fn test_add_trait() {
        let a = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let b = NumericMatrix::from_flat(2, 2, vec![5.0, 6.0, 7.0, 8.0]).unwrap();
        let c = (&a + &b).unwrap();
        assert_eq!(c.get(0, 0).unwrap(), 6.0);
    }

    #[test]
    fn test_sub_trait() {
        let a = NumericMatrix::from_flat(2, 2, vec![5.0, 6.0, 7.0, 8.0]).unwrap();
        let b = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let c = (&a - &b).unwrap();
        assert_eq!(c.get(0, 0).unwrap(), 4.0);
    }

    #[test]
    fn test_mul_trait() {
        let a = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let b = &a * 2.0;
        assert_eq!(b.get(0, 0).unwrap(), 2.0);

        let c = 3.0 * &a;
        assert_eq!(c.get(0, 0).unwrap(), 3.0);
    }

    #[test]
    fn test_neg_trait() {
        let a = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let b = -&a;
        assert_eq!(b.get(0, 0).unwrap(), -1.0);
    }

    #[test]
    fn test_dimension_mismatch() {
        let a = NumericMatrix::from_flat(2, 2, vec![1.0, 2.0, 3.0, 4.0]).unwrap();
        let b = NumericMatrix::from_flat(2, 3, vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0]).unwrap();
        assert!(NumericMatrix::add(&a, &b).is_err());
        assert!(NumericMatrix::sub(&a, &b).is_err());
    }
}