Function fromField

Example

// Returns (4, 1) (evaluates f(x, y) at point (2, 1))
const f = Chalkboard.vect.field(
    (x, y) => x ** 2,
    (x, y) => y
);
const v = Chalkboard.vect.fromField(f, Chalkboard.vect.init(2, 1));
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