Lorenz

File: lorenz.html (click for a live demo)
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>math.js | Lorenz Attractor</title>
    <script src="https://unpkg.com/mathjs@14.0.1/lib/browser/math.js"></script>

    <script src="https://cdn.plot.ly/plotly-2.25.2.min.js" charset="utf-8"></script>
    <style>
        html, body {
            width: 100%;
            height: 100vh;
            padding: 0;
            margin: 0;
        } 
        body {
            display: flex;
            flex-direction: column;
        }

        #LorenzGraph {
            flex: 1;
        }
    </style>
</head>

<body>
    <div id="LorenzGraph"></div>
</body>
<script defer>

    // define the constants for the Lorenz attractor
    const sigma = 10
    const beta = 2.7
    const rho = 28

    // solve the Lorenz attractor
    const sol = math.solveODE(lorenz, [0, 100], [1, 1, 1])

    // make colors that represents time differences in the solution
    const diff = math.diff(sol.t)
    const color = [diff[0], ...diff]

    // render the plot using plotly
    Plotly.newPlot('LorenzGraph',
        [{
            x: sol.y.map(u => u[0]),
            y: sol.y.map(u => u[1]),
            z: sol.y.map(u => u[2]),
            line: { color, colorscale: 'Jet' },
            type: "scatter3d",
            mode: "lines"
        }],
        {
            responsive: true,
            uirevision: 'true',
            title:"Lorenz Attractor",
        }
    )

    // define the lorenz attractor
    function lorenz(t, u) {
        const [x, y, z] = u
        return [
            sigma * (y - x),
            x * (rho - z) - y,
            x * y - beta * z
        ]
    }
</script>

</html>