List of usage examples for java.lang Math acos
public static double acos(double a)
From source file:org.apache.hadoop.hive.ql.udf.UDFAcos.java
public DoubleWritable evaluate(DoubleWritable a) { if (a == null) { return null; } else {// w w w . java 2 s.c o m result.set(Math.acos(a.get())); return result; } }
From source file:org.jcurl.model.PathSegmentTest.java
public void testTrafo() throws NoninvertibleTransformException { final Point2D x0 = new Point2D.Double(1.5, 2.5); // final Point2D x0 = new Point2D.Double(0, 0); final Point2D v0 = new Point2D.Double(2, 1); // build the trafo final AffineTransform rc2wc = new AffineTransform(); {/*from w ww. j a v a2 s.co m*/ rc2wc.rotate(-Math.acos((v0.getX() * 0 + v0.getY() * 1) / v0.distance(0, 0)), x0.getX(), x0.getY()); rc2wc.translate(x0.getX(), x0.getY()); } // check some points. // wc(x0) -> rc(0,0) Point2D tmp = rc2wc.inverseTransform(x0, null); assertEquals("", 0, tmp.getX(), 1e-9); assertEquals("", 0, tmp.getY(), 1e-9); // rc(0,1) -> wc(x0) tmp = rc2wc.transform(new Point2D.Double(0, 1), null); assertEquals("", x0.getX() + 0.8944271909999, tmp.getX(), 1e-6); assertEquals("", x0.getY() + 0.4472135954999, tmp.getY(), 1e-6); }
From source file:com.opengamma.analytics.math.rootfinding.CubicRootFinder.java
/** * {@inheritDoc}//from ww w . j a v a2s. c om * @throws IllegalArgumentException If the function is not cubic */ @Override public ComplexNumber[] getRoots(final RealPolynomialFunction1D function) { Validate.notNull(function, "function"); final double[] coefficients = function.getCoefficients(); Validate.isTrue(coefficients.length == 4, "Function is not a cubic"); final double divisor = coefficients[3]; final double a = coefficients[2] / divisor; final double b = coefficients[1] / divisor; final double c = coefficients[0] / divisor; final double aSq = a * a; final double q = (aSq - 3 * b) / 9; final double r = (2 * a * aSq - 9 * a * b + 27 * c) / 54; final double rSq = r * r; final double qCb = q * q * q; final double constant = a / 3; if (rSq < qCb) { final double mult = -2 * Math.sqrt(q); final double theta = Math.acos(r / Math.sqrt(qCb)); return new ComplexNumber[] { new ComplexNumber(mult * Math.cos(theta / 3) - constant, 0), new ComplexNumber(mult * Math.cos((theta + TWO_PI) / 3) - constant, 0), new ComplexNumber(mult * Math.cos((theta - TWO_PI) / 3) - constant, 0) }; } final double s = -Math.signum(r) * Math.cbrt(Math.abs(r) + Math.sqrt(rSq - qCb)); final double t = CompareUtils.closeEquals(s, 0, 1e-16) ? 0 : q / s; final double sum = s + t; final double real = -0.5 * sum - constant; final double imaginary = Math.sqrt(3) * (s - t) / 2; return new ComplexNumber[] { new ComplexNumber(sum - constant, 0), new ComplexNumber(real, imaginary), new ComplexNumber(real, -imaginary) }; }
From source file:org.netxilia.functions.MathFunctions.java
public double ACOS(double number) { return Math.acos(number); }
From source file:resources.common.MathUtilities.java
public static boolean fov(Point3D o, Quaternion a, Point3D t, float fov) { return (Math.abs(Math.acos(Vector3D.dotProduct((new Vector3D(a.x, a.y, a.z)).normalize(), (new Vector3D(t.x - o.x, t.z - o.z, t.y - o.y)).normalize()))) <= (((int) fov) / 2)); }
From source file:Main.java
public static void cosineSimilarityCW() { Iterator<Integer> ids = CommentWordCount.keySet().iterator(); while (ids.hasNext()) { int com_id = ids.next(); Set<String> words1; words1 = CommentWordCount.get(com_id).keySet(); Iterator<Integer> com_iter = CommentWordCount.keySet().iterator(); while (com_iter.hasNext()) { int id = com_iter.next(); if (com_id < id) { Set<String> words2; words2 = CommentWordCount.get(id).keySet(); Vector<Integer> vecA = new Vector<Integer>(); Vector<Integer> vecB = new Vector<Integer>(); Iterator<String> w1 = words1.iterator(); Iterator<String> w2 = words2.iterator(); HashSet<String> imp = new HashSet<String>(); while (w1.hasNext()) { String s = w1.next(); imp.add(s);//from w ww. j a v a 2 s.c om } while (w2.hasNext()) { String s = w2.next(); imp.add(s); } for (String s : imp) { if (CommentWordCount.get(com_id).containsKey(s)) { vecA.add(CommentWordCount.get(com_id).get(s)); } else vecA.add(0); if (CommentWordCount.get(id).containsKey(s)) { vecB.add(CommentWordCount.get(id).get(s)); } else vecB.add(0); } //System.out.println("Size : A"+vecA.size()+" Size: B"+vecB.size()+"maxLen:"+maxlength); double similarity; int product = 0; double sumA = 0; double sumB = 0; for (int i = 0; i < vecA.size(); i++) { product += vecA.elementAt(i) * vecB.elementAt(i); sumA += vecA.elementAt(i) * vecA.elementAt(i); sumB += vecB.elementAt(i) * vecB.elementAt(i); } sumA = Math.sqrt(sumA); sumB = Math.sqrt(sumB); similarity = product / (sumA * sumB); similarity = Math.acos(similarity) * 180 / Math.PI; //System.out.println("Result "+com_id+" "+id+" :"+similarity); if (similarity < 75) { //System.out.println("Result "+com_id+" "+id); if (Topic.containsKey(com_id)) { int val = Topic.get(com_id); val++; Topic.put(com_id, val); } else Topic.put(com_id, 1); if (Topic.containsKey(id)) { int val = Topic.get(id); val++; Topic.put(id, val); } else Topic.put(id, 1); } } } } }
From source file:org.esa.beam.util.math.FastMathTest.java
@Test public void testMathACos() { for (double i = 0; i < numItr; ++i) { double val = Math.acos(i); }/*from ww w . j av a 2 s .co m*/ }
From source file:net.nicoulaj.benchmarks.math.DoubleAcos.java
@GenerateMicroBenchmark public void math(BlackHole hole) { for (int i = 0; i < data.length - 1; i++) hole.consume(Math.acos(data[i])); }
From source file:com.example.blockcanary_demo.DemoFragment.java
private static double compute() { double result = 0; for (int i = 0; i < 1000000; ++i) { result += Math.acos(Math.cos(i)); result -= Math.asin(Math.sin(i)); }//from w w w .j a v a 2 s . c om return result; }
From source file:controller.JsonController.java
public ArrayList<JsonModel> ReadJsonCalc() throws FileNotFoundException, IOException, ParseException { FileInputStream fstream = new FileInputStream("gistfile1.txt"); BufferedReader br = new BufferedReader(new InputStreamReader(fstream)); String strLine;/* w ww . j a va 2 s . c om*/ ArrayList<JsonModel> result = new ArrayList<>(); JsonModel model; double L1, G1, L2, G2; //Read File Line By Line while ((strLine = br.readLine()) != null) { model = new JsonModel(); JSONParser parser = new JSONParser(); Object obj = parser.parse(strLine); JSONObject jsonObject = (JSONObject) obj; model.setLatitude((double) Double.parseDouble((String) jsonObject.get("latitude"))); model.setLongitude((double) Double.parseDouble((String) jsonObject.get("longitude"))); model.setUserIid((int) Integer.parseInt((String) jsonObject.get("user_id").toString())); model.setName(((String) jsonObject.get("name"))); L1 = Math.toRadians(model.getLatitudeDefault()); G1 = Math.toRadians(model.getLongitudeDefault()); L2 = Math.toRadians(model.getLatitude()); G2 = Math.toRadians(model.getLongitude()); // do the spherical trig calculation double angle = Math.acos(Math.sin(L1) * Math.sin(L2) + Math.cos(L1) * Math.cos(L2) * Math.cos(G1 - G2)); // convert back to degrees angle = Math.toDegrees(angle); // each degree on a great circle of Earth is 69.1105 miles double distance = (69.1105 * angle) * 1.609344; if (distance <= 100) result.add(model); } Collections.sort(result); return result; }