Plot a continuous function

[vwkd]

What's the best way to plot a continuous function?

The documentation of Plot seems to use only sets of discrete values.

Do I need to manually select the discrete set of values in the domain and compute the range? What step size is optimal for Plot?

Or can I provide the function to plot such that it doesn't need to interpolate between my discrete set of values?

For example, here's a function $f(x) = x^2$ on the domain $[0, 3]$ with the arbitrarily chosen step size $0.01$.

const f = (x) => x * x;

const data = d3
  .range(0, 3, 0.01)
  .map((x) => ({ x, y: f(x) }));

Plot.plot({
  marks: [
    Plot.line(data, { x: "x", y: "y" }),
  ],
});

[Fil]

Plot has no special affordances for plotting functions. Your approach is correct for well-behaved functions; for generic functions, though, it's way more complicated, see for example https://mauriciopoppe.github.io/function-plot/