### Question:
VectorMath { public static float[] randomVectorF(int features, RandomGenerator random) { float[] vector = new float[features]; for (int i = 0; i < features; i++) { vector[i] = (float) random.nextGaussian(); } return vector; } private  VectorMath(); static double dot(float[] x, float[] y); static double norm(float[] x); static double norm(double[] x); static double cosineSimilarity(float[] x, float[] y, double normY); static double[] transposeTimesSelf(Collection<float[]> M); static double[] parseVector(String[] values); static float[] randomVectorF(int features, RandomGenerator random);  }### Answer:
@Test public void testRandomF() { RandomGenerator random = RandomManager.getRandom(); float[] vec1 = VectorMath.randomVectorF(10, random); float[] vec2 = VectorMath.randomVectorF(10, random); assertEquals(10, vec1.length); assertEquals(10, vec2.length); assertFalse(Arrays.equals(vec1, vec2)); }