Function expectBignum

test/compute-engine/special-functions.test.ts:611–625

(expr: any, expectedPrefix: string)

      'x',
      -1,
    ]);
    // The parsed form reaches the W₋₁ numeric kernel
    const w = ce.parse('\\operatorname{W}_{-1}(-0.1)').N().re;
    expect(Math.abs(w - -3.577152063957297)).toBeLessThan(1e-10);
  });
});

describe('BESSEL J FUNCTION', () => {
  test('J_0(0) = 1', () => {
    expectApprox(ce.expr(['BesselJ', 0, 0]), 1);
  });

  test('J_1(0) = 0', () => {
    expectApprox(ce.expr(['BesselJ', 1, 0]), 0);
  });

  test('J_0(1) ≈ 0.7651976865579666', () => {
    expectApprox(ce.expr(['BesselJ', 0, 1]), 0.7651976865579666);