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
use std::time::SystemTime;
const PI: f64 = 3.141592654;
const RAND_MAX: f64 = 2147483647.0;
pub enum Style {
PMrand,
Gauss,
BMrand,
Marsaglia,
Lazy,
Crand,
}
pub struct Rand {
style: Style,
seed: i64,
attachment: Vec<f64>,
}
impl Rand {
pub fn new(style: Style) -> Self {
Rand {
style: style,
seed: 1,
attachment: Vec::new(),
}
}
pub fn srand(&mut self, seed: i64) {
self.seed = seed;
}
pub fn lazy_srand(&mut self) {
let sys_time = SystemTime::now();
let foo_string = format!("{:?}", sys_time);
let mut seed: i64 = 0;
let mut flag = false;
for num in foo_string.chars() {
match num {
e @ '0'...'9' => {
flag = true;
seed = seed * 10 + (e as u8 - 48) as i64;
if seed >= i32::max_value() as i64 {
break;
}
}
_ => {
if flag {
break;
}
}
}
}
if seed > 0 {
match self.style {
Style::Lazy | Style::PMrand => self.seed = seed,
Style::Crand => self.seed = 1,
_ => self.seed = seed >> 32,
}
} else {
self.seed = 1;
}
}
pub fn get_rand(&mut self) -> f64 {
match self.style {
Style::PMrand => {
self.seed = Rand::pmrand(self.seed, 48271);
self.seed as f64 / RAND_MAX.abs()
}
Style::Gauss => (Rand::gauss(&mut self.seed, 25) / RAND_MAX).abs(),
Style::BMrand => (Rand::bmrand(&mut self.seed, &mut self.attachment) / RAND_MAX).abs(),
Style::Marsaglia => (Rand::marsaglia(&mut self.seed, &mut self.attachment) / RAND_MAX).abs(),
Style::Crand => (Rand::crand(&mut self.seed) as f64 / RAND_MAX).abs(),
_ => {
self.seed = Rand::lazy(self.seed);
(self.seed as f64 / RAND_MAX).abs()
}
}
}
fn pmrand(seed: i64, a: i64) -> i64 {
let m = RAND_MAX as i64;
let q = m / a;
let r = m % a;
let hi = seed / q;
let lo = seed % q;
let test = a * lo - r * hi;
if test > 0 { test } else { test + m }
}
fn gauss(seed: &mut i64, nsum: i64) -> f64 {
let mut x = 0.0;
for _ in 0..nsum {
*seed = Rand::pmrand(*seed, 48271);
x += *seed as f64 / RAND_MAX;
}
x -= nsum as f64 / 2.0;
x /= (nsum as f64 / 12.0).sqrt();
x
}
fn bmrand(seed: &mut i64, attachment: &mut Vec<f64>) -> f64 {
#[allow(unused_assignments)]
let mut z = 0.0;
if attachment.len() == 0 {
attachment.push(0.0);
attachment.push(0.0);
attachment.push(0.0);
}
if attachment[2] == 0.0 {
*seed = Rand::pmrand(*seed, 48271);
attachment[0] = (*seed as f64 + 1.0) / (RAND_MAX + 2.0);
*seed = Rand::pmrand(*seed, 48271);
attachment[1] = *seed as f64 / (RAND_MAX + 1.0);
z = (2.0 * PI * attachment[1]).sin();
} else {
z = (2.0 * PI * attachment[1]).cos();
}
z *= (-2.0 * attachment[0].log(10.0)).sqrt();
attachment[2] = 1.0 - attachment[2];
z
}
fn marsaglia(seed: &mut i64, attachment: &mut Vec<f64>) -> f64 {
#[allow(unused_assignments)]
let mut x = 0.0;
if attachment.len() == 0 {
attachment.push(0.0);
attachment.push(0.0);
attachment.push(0.0);
attachment.push(0.0);
}
if attachment[3] == 0.0 {
loop {
*seed = Rand::pmrand(*seed, 48271);
let u1 = *seed as f64 / RAND_MAX;
*seed = Rand::pmrand(*seed, 48271);
let u2 = *seed as f64 / RAND_MAX;
attachment[0] = 2.0 * u1 - 1.0;
attachment[1] = 2.0 * u2 - 1.0;
attachment[2] = attachment[0] * attachment[0] + attachment[1] * attachment[1];
if attachment[2] < 1.0 && attachment[2] != 0.0 {
break;
}
}
x = attachment[0] * (-2.0 * attachment[2].log(10.0) / attachment[2]);
} else {
x = attachment[1] * (-2.0 * attachment[2].log(10.0) / attachment[2]);
}
attachment[3] = 1.0 - attachment[3];
x
}
fn lazy(seed: i64) -> i64 {
Rand::pmrand(seed, 16807)
}
fn crand(seed: &mut i64) -> i64 {
*seed = *seed * 1103515245 + 12345;
(*seed >> 16) & (RAND_MAX as i64)
}
}
#[macro_export]
macro_rules! rand {
() => {{
let mut foo = Rand::new(Style::Lazy);
foo.lazy_srand();
foo.get_rand()
}};
($num: expr) => {{
let mut foo = Rand::new(Style::Lazy);
let mut bar: Vec<f64> = Vec::new();
foo.lazy_srand();
for _ in 0..$num {
bar.push(foo.get_rand());
}
bar
}};
($style: path) => {{
let mut foo = Rand::new($style);
foo.lazy_srand();
foo.get_rand()
}};
($style: path, $num: expr) => {{
let mut foo = Rand::new($style);
let mut bar: Vec<f64> = Vec::new();
foo.lazy_srand();
for _ in 0..$num {
bar.push(foo.get_rand());
}
bar
}};
}