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
|
use plotters::prelude::*;
use rand::SeedableRng;
use rand_distr::{Distribution, Normal};
use rand_xorshift::XorShiftRng;
use num_traits::sign::Signed;
const OUT_FILE_NAME: &'static str = "plotters-doc-data/normal-dist2.png";
fn main() -> Result<(), Box<dyn std::error::Error>> {
let sd = 0.60;
let random_points: Vec<f64> = {
let norm_dist = Normal::new(0.0, sd).unwrap();
let mut x_rand = XorShiftRng::from_seed(*b"MyFragileSeed123");
let x_iter = norm_dist.sample_iter(&mut x_rand);
x_iter.take(5000).filter(|x| x.abs() <= 4.0).collect()
};
let root = BitMapBackend::new(OUT_FILE_NAME, (1024, 768)).into_drawing_area();
root.fill(&WHITE)?;
let mut chart = ChartBuilder::on(&root)
.margin(5)
.caption("1D Gaussian Distribution Demo", ("sans-serif", 30))
.set_label_area_size(LabelAreaPosition::Left, 60)
.set_label_area_size(LabelAreaPosition::Bottom, 60)
.set_label_area_size(LabelAreaPosition::Right, 60)
.build_cartesian_2d(-4f64..4f64, 0f64..0.1)?
.set_secondary_coord(
(-4f64..4f64).step(0.1).use_round().into_segmented(),
0u32..500u32,
);
chart
.configure_mesh()
.disable_x_mesh()
.disable_y_mesh()
.y_label_formatter(&|y| format!("{:.0}%", *y * 100.0))
.y_desc("Percentage")
.draw()?;
chart.configure_secondary_axes().y_desc("Count").draw()?;
let actual = Histogram::vertical(chart.borrow_secondary())
.style(GREEN.filled())
.margin(3)
.data(random_points.iter().map(|x| (*x, 1)));
chart
.draw_secondary_series(actual)?
.label("Observed")
.legend(|(x, y)| Rectangle::new([(x, y - 5), (x + 10, y + 5)], GREEN.filled()));
let pdf = LineSeries::new(
(-400..400).map(|x| x as f64 / 100.0).map(|x| {
(
x,
(-x * x / 2.0 / sd / sd).exp() / (2.0 * std::f64::consts::PI * sd * sd).sqrt()
* 0.1,
)
}),
&RED,
);
chart
.draw_series(pdf)?
.label("PDF")
.legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], RED.filled()));
chart.configure_series_labels().draw()?;
// To avoid the IO failure being ignored silently, we manually call the present function
root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
println!("Result has been saved to {}", OUT_FILE_NAME);
Ok(())
}
#[test]
fn entry_point() {
main().unwrap()
}
|
