List of usage examples for java.lang Math abs
@HotSpotIntrinsicCandidate public static double abs(double a)
From source file:Main.java
/** * Returns the size of an ulp of the argument. An ulp of a * <code>double</code> value is the positive distance between this * floating-point value and the <code>double</code> value next * larger in magnitude. Note that for non-NaN <i>x</i>, * <code>ulp(-<i>x</i>) == ulp(<i>x</i>)</code>. * * <p>Special Cases:/*from w ww .j a va2 s. c o m*/ * <ul> * <li> If the argument is NaN, then the result is NaN. * <li> If the argument is positive or negative infinity, then the * result is positive infinity. * <li> If the argument is positive or negative zero, then the result is * <code>Double.MIN_VALUE</code>. * <li> If the argument is ±<code>Double.MAX_VALUE</code>, then * the result is equal to 2<sup>971</sup>. * </ul> * * @param d the floating-point value whose ulp is to be returned * @return the size of an ulp of the argument * @author Joseph D. Darcy * @since 1.5 */ public static double ulp(double d) { int exp = getExponent(d); switch (exp) { case DoubleConsts.MAX_EXPONENT + 1: // NaN or infinity return Math.abs(d); // break; case DoubleConsts.MIN_EXPONENT - 1: // zero or subnormal return Double.MIN_VALUE; // break default: assert exp <= DoubleConsts.MAX_EXPONENT && exp >= DoubleConsts.MIN_EXPONENT; // ulp(x) is usually 2^(SIGNIFICAND_WIDTH-1)*(2^ilogb(x)) exp = exp - (DoubleConsts.SIGNIFICAND_WIDTH - 1); if (exp >= DoubleConsts.MIN_EXPONENT) { return powerOfTwoD(exp); } else { // return a subnormal result; left shift integer // representation of Double.MIN_VALUE appropriate // number of positions return Double.longBitsToDouble( 1L << (exp - (DoubleConsts.MIN_EXPONENT - (DoubleConsts.SIGNIFICAND_WIDTH - 1)))); } // break } }
From source file:de.tuberlin.uebb.jdae.diff.partial.PDNumberTest.java
public static boolean approximate(final PDNumber number, final PDNumber testee) { if (testee.values.length != number.values.length) return false; for (int i = 0; i < testee.values.length; i++) if (Math.abs(testee.values[i] - number.values[i]) > TOLERANCE) return false; return true;/* w w w .j a va 2 s . c om*/ }
From source file:com.algoTrader.service.PositionServiceImpl.java
@Override protected void handleClosePosition(int positionId) throws Exception { Position position = getPositionDao().load(positionId); reducePosition(positionId, Math.abs(position.getQuantity())); }
From source file:net.duckling.ddl.web.agent.util.AuthUtil.java
private static boolean notExpired(Date d) { long now = System.currentTimeMillis(); long dd = d.getTime(); //??30/* ww w .j ava2 s . com*/ if (Math.abs((now - dd)) < (1000 * 60 * 30)) { return true; } return false; }
From source file:org.mwc.debrief.track_shift.views.CachedTickDateAxis.java
@SuppressWarnings("rawtypes") @Override/*from w w w .ja v a 2 s . co m*/ protected List refreshTicksVertical(final Graphics2D g2, final Rectangle2D dataArea, final RectangleEdge edge) { // do we have a height? if (_lastHeight != null) { // is the new height different to our last one? if (Math.abs(dataArea.getHeight() - _lastHeight.doubleValue()) > 60) { // yes - ditch the ticks _myTicks = null; } } // do we have any ticks? if (_myTicks == null) { // nope, better create some _myTicks = super.refreshTicksVertical(g2, dataArea, edge); _lastHeight = dataArea.getHeight(); } return _myTicks; }
From source file:ImageDuplicity.java
private void createOffscreenImage() { Dimension d = getSize();//from ww w . j a v a 2 s.co m int width = d.width; int height = d.height; image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = image.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); try { String filename = "largeJava2sLogo.jpg"; InputStream in = getClass().getResourceAsStream(filename); JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in); BufferedImage image = decoder.decodeAsBufferedImage(); in.close(); g2.drawImage(image, 0, 0, width, height, null); } catch (Exception e) { System.out.print(e); } g2.setStroke(new BasicStroke(2)); Color[] colors = { Color.red, Color.blue, Color.green }; for (int i = -32; i < 40; i += 8) { g2.setPaint(colors[Math.abs(i) % 3]); g2.drawOval(i, i, width - i * 2, height - i * 2); } }
From source file:edu.illinois.cs.cogcomp.saul.test.TestReal.java
public TestReal(Learner classifier, Classifier oracle, Parser parser) { int examples = 0; double totalDifference = 0; double[] actuals = {}; double[] predictions = {}; classifier.write(System.out); for (Object example = parser.next(); example != null; example = parser.next()) { double prediction = classifier.realValue(example); predictions = Arrays.copyOf(predictions, predictions.length + 1); predictions[predictions.length - 1] = prediction; double value = oracle.realValue(example); actuals = Arrays.copyOf(actuals, actuals.length + 1); actuals[actuals.length - 1] = value; double difference = Math.abs(prediction - value); totalDifference += difference;//from w w w.ja va2 s . c o m classifier.classify(example); ++examples; System.out.println( "Example " + examples + " difference: " + difference + " (prediction: " + prediction + ")"); } System.out.println("test examples number: " + examples); double avg = totalDifference / examples; System.out.println("Average difference: " + avg); double p = getPearsonCorrelation(predictions, actuals); System.out.println("Pearson correlation:" + p); SpearmansCorrelation e = new SpearmansCorrelation(); double sp = e.correlation(predictions, actuals); System.out.println("Spearman correlation:" + sp); }
From source file:com.opengamma.analytics.math.interpolation.RationalFunctionInterpolator1D.java
@Override public Double interpolate(final Interpolator1DDataBundle data, final Double value) { Validate.notNull(value, "value"); Validate.notNull(data, "data bundle"); final int m = _degree + 1; if (data.size() < m) { throw new IllegalArgumentException( "Need at least " + (_degree + 1) + " data points to perform this interpolation"); }/*from w ww. ja v a 2s . c o m*/ final double[] xArray = data.getKeys(); final double[] yArray = data.getValues(); final int n = data.size() - 1; if (data.getLowerBoundIndex(value) == n) { return yArray[n]; } double diff = Math.abs(value - xArray[0]); if (Math.abs(diff) < _eps) { return yArray[0]; } double diff1; final double[] c = new double[m]; final double[] d = new double[m]; int ns = 0; for (int i = 0; i < m; i++) { diff1 = Math.abs(value - xArray[i]); if (diff < _eps) { return yArray[i]; } else if (diff1 < diff) { ns = i; diff = diff1; } c[i] = yArray[i]; d[i] = yArray[i] + _eps; } double y = yArray[ns--]; double w, t, dd; for (int i = 1; i < m; i++) { for (int j = 0; j < m - i; j++) { w = c[j + 1] - d[j]; diff = xArray[i + j] - value; t = (xArray[j] - value) * d[j] / diff; dd = t - c[j + 1]; if (Math.abs(dd) < _eps) { throw new MathException("Interpolating function has a pole at x = " + value); } dd = w / dd; d[j] = c[j + 1] * dd; c[j] = t * dd; } y += 2 * (ns + 1) < m - i ? c[ns + 1] : d[ns--]; } return y; }
From source file:net.gtaun.shoebill.data.Velocity.java
public float angleZ() { return (float) Math.acos(getZ() / Math.abs(speed3d())); }