let x = nj.arange(-50, 50).divide(10)
let ctx = document.getElementById('chart').getContext('2d');
ctx.canvas.parentNode.style.height = "240px";
ctx.canvas.parentNode.style.width = "320px";
new Chart(ctx, {
    type: 'line',
    data: {
        labels: x.selection.data,
        datasets: [
            {
                label: "sin(x)",
                data: nj.sin(x).selection.data,
                fill: false,
                borderColor: "#2196F3",
                radius: 0,
            },
            {
                label: "cos(x)",
                data: nj.cos(x).selection.data,
                fill: false,
                borderColor: "#FF9800",
                radius: 0,
            }
        ]
    },
    options: {
        responsive: true,
    }
});