trk 0.2.0

Simple terminal-based time-series data recorder and plotter.
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

//! Helpers for passing the data into plots.
//!
//! Merely a bunch of functions hanging around while the library API is taking shape.

/// Transforms points into frequency distribution (for using in histograms).
/// ```
/// # extern crate textplots;
/// # use textplots::utils::histogram;
/// assert_eq!(vec![(0.0, 1.0), (5.0, 1.0)], histogram( &[ (0.0, 0.0), (9.0, 9.0), (10.0, 10.0) ], 0.0, 10.0, 2 ));
/// ```
pub fn histogram(data: &[(f32, f32)], min: f32, max: f32, bins: usize) -> Vec<(f32, f32)> {
    let mut output = vec!(0; bins);

    let step = (max - min) / bins as f32;

    for &(_x, y) in data.iter() {
        if y < min || y > max {
            continue;
        }

        let bucket_id = ((y - min) / step) as usize;
        if bucket_id < output.len() {
            output[bucket_id as usize] += 1;
        }
    }

    output
        .into_iter()
        .enumerate()
        .map(|(x, y)| ((min + (x as f32) * step), y as f32) )
        .collect()
}