Example usage for java.math RoundingMode DOWN

Introduction

In this page you can find the example usage for java.math RoundingMode DOWN.

Prototype

RoundingMode DOWN

To view the source code for java.math RoundingMode DOWN.

Click Source Link

Document

Rounding mode to round towards zero.

Usage

From source file:net.lizalab.util.RdRandRandomTest.java

/**
 * Runs the Monte Carlo Pi approximation test for the specified
 * instance of Random./*from   w w  w .j  a v a 2  s.c om*/
 * @param random The RNG instance to test.
 * @param doAssert Flag to indicate whether result should be asserted or simply logged.
 */
private void monteCarloPiTest(Random random, boolean doAssert) {
    final String methodName = "monteCarloPiTest : ";

    int inRandCircle = 0;

    // xr and yr will be the random point
    // zr will be the calculated distance to the center
    double xr, yr, zr;

    long start = System.currentTimeMillis();
    for (int i = 0; i < numPoints; i++) {
        xr = random.nextDouble();
        yr = random.nextDouble();

        zr = (xr * xr) + (yr * yr);
        if (zr <= 1.0) {
            inRandCircle++;
        }
    }
    long end = System.currentTimeMillis();
    LOGGER.info("{} Time: {}ms", methodName, end - start);

    // calculate the Pi approximations
    double randomPi = (double) inRandCircle / numPoints * 4.0;

    // calculate the difference and % error
    double diff = (randomPi - Math.PI);
    double randomError = diff / Math.PI * 100;
    LOGGER.info("{} Pi Approximation: {}, Diff: {}, Error %: {}", methodName, randomPi, diff, randomError);
    BigDecimal randomPiBD = new BigDecimal(randomPi);
    randomPiBD = randomPiBD.setScale(precision - 1, RoundingMode.DOWN);
    // Verify result.
    boolean result = randomPiBD.compareTo(pi) == 0;
    String msg = "Pi approximation not sufficiently precise for " + random.getClass();
    if (doAssert) {
        assertTrue(msg, result);
    } else {
        if (!result) {
            LOGGER.warn("{} {}", methodName, msg);
        }
    }
}

---

From source file:com.coinblesk.client.utils.UIUtils.java

public static String coinToAmount(Context context, Coin coin) {
    // transform a given coin value to the "amount string".
    BigDecimal coinAmount = new BigDecimal(coin.getValue());
    BigDecimal div = new BigDecimal(Coin.COIN.getValue());

    if (SharedPrefUtils.isBitcoinScaleBTC(context)) {
        div = new BigDecimal(Coin.COIN.getValue());
    } else if (SharedPrefUtils.isBitcoinScaleMilliBTC(context)) {
        div = new BigDecimal(Coin.MILLICOIN.getValue());
    } else if (SharedPrefUtils.isBitcoinScaleMicroBTC(context)) {
        div = new BigDecimal(Coin.MICROCOIN.getValue());
    }/*from   w w w.  j av a 2s . co  m*/

    DecimalFormat df = new DecimalFormat("#.####");
    df.setRoundingMode(RoundingMode.DOWN);
    df.setMaximumFractionDigits(4);
    DecimalFormatSymbols decFormat = new DecimalFormatSymbols();
    decFormat.setDecimalSeparator('.');
    df.setDecimalFormatSymbols(decFormat);
    String amount = df.format(coinAmount.divide(div));
    return amount;
}

---

From source file:com.github.rutvijkumar.twittfuse.Util.java

public static CharSequence formatCount(long count, boolean isUserCount) {
    // TODO Auto-generated method stub
    if (count < 1000) {
        return String.valueOf(count);
    } else {/*from  w  ww .java  2 s  .  com*/
        String result = null;

        NumberFormat df = DecimalFormat.getInstance();
        df.setRoundingMode(RoundingMode.DOWN);

        double countWithK = count / 1000.0;
        if (isUserCount) {
            df.setMinimumFractionDigits(0);
            df.setMaximumFractionDigits(0);
        } else {
            df.setMinimumFractionDigits(1);
            df.setMaximumFractionDigits(1);
        }
        result = df.format(countWithK);
        result = result + "K";
        return result;
    }

}

---

From source file:net.lizalab.util.RdRandRandomTest.java

/**
 * Tests RdRandRandom using the Monte Carlo Pi approximation test.
 * Also runs the test for Random and SecureRandom for reference.
 * @throws GeneralSecurityException //from  w ww .  j  av a2s  . c om
 * @throws SeedException 
 */
@Test
public final void testRdRandRandomMonteCarloPi() throws SeedException, GeneralSecurityException {
    final String methodName = "testRdRandRandomMonteCarloPiTest : ";

    precision = expectedPrecision(numPoints);
    // Since the first digit for pi is before the decimal point, we adjust the scale accordingly.
    pi = pi.setScale(precision - 1, RoundingMode.DOWN);
    LOGGER.info("{} Generating {} points for Monte Carlo Pi Test. Expected precision: {} digits, {}",
            methodName, numPoints, precision, pi.toPlainString());

    LOGGER.info("{} Running for Random..", methodName);
    Random random = new Random();
    monteCarloPiTest(random, false);

    LOGGER.info("{} Running for RdRand..", methodName);
    random = new RdRandRandom();
    monteCarloPiTest(random, true);

    LOGGER.info("{} Running for SecureRandom..", methodName);
    random = new SecureRandom();
    monteCarloPiTest(random, false);

    LOGGER.info("{} Running Uncommons Maths AESCounterRNG using RdRandSeedGenerator..", methodName);
    random = new AESCounterRNG(new RdRandSeedGenerator());
    monteCarloPiTest(random, false);
}

---

From source file:org.multibit.utils.CSMiscUtils.java

public static BigDecimal getDisplayUnitsForRawUnits(CSAsset asset, BigInteger rawQuantity) {
    if (asset == null)
        return BigDecimal.ZERO;
    CoinSparkGenesis genesis = asset.getGenesis();
    if (genesis == null)
        return BigDecimal.ZERO; // This can happen with brand new Manually transferred asset which has not yet been validated.
    int chargeBasisPoints = genesis.getChargeBasisPoints();
    int chargeExponent = genesis.getChargeFlatExponent();
    int chargeMantissa = genesis.getChargeFlatMantissa();
    int qtyExponent = genesis.getQtyExponent();
    int qtyMantissa = genesis.getQtyMantissa();

    double interestRate = asset.getInterestRate();
    Date issueDate = asset.getIssueDate();

    BigDecimal result = new BigDecimal(rawQuantity.toString());

    //System.out.println("interest rate = " + interestRate);
    //System.out.println("issue date = " + issueDate);

    //System.out.println("raw units =" + result);

    // 1. Compute interest
    if (issueDate != null && interestRate != 0.0) {

        BigDecimal rate = new BigDecimal(String.valueOf(interestRate));
        rate = rate.divide(new BigDecimal(100));
        rate = rate.add(BigDecimal.ONE);
        //interestRate = interestRate / 100;

        //System.out.println("interest rate 1 + ir/100 = " + rate.toPlainString());

        // get years elapsed
        DateTime d1 = new DateTime(issueDate);
        DateTime d2 = new DateTime();

        //System.out.println("Issue: " + d1 + "   Now: " + d2);
        int seconds = Math.abs(Seconds.secondsBetween(d1, d2).getSeconds());

        //System.out.println("...Number of seconds difference: " + seconds);

        BigDecimal elapsedSeconds = new BigDecimal(seconds);

        //System.out.println("...Number of seconds difference: " + elapsedSeconds.toPlainString());

        // To avoid exception, we need to set a precision.
        // java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
        // http://stackoverflow.com/questions/4591206/arithmeticexception-non-terminating-decimal-expansion-no-exact-representable
        BigDecimal elapsedYears = elapsedSeconds.divide(new BigDecimal(COINSPARK_SECONDS_IN_YEAR),
                MathContext.DECIMAL32);
        //System.out.println("...Number of years difference: " + elapsedYears.toPlainString());

        double base = elapsedSeconds.doubleValue();
        double exp = elapsedYears.doubleValue();
        //System.out.println("...base=" + base + "  exponent=" + exp);
        double interestMultipler = Math.pow(rate.doubleValue(), elapsedYears.doubleValue());

        //System.out.println("interest multipler =" + interestMultipler);

        result = result.multiply(new BigDecimal(interestMultipler));

        //System.out.println("raw units with interest multiplier =" + result);

        result = result.setScale(0, RoundingMode.DOWN);

        //System.out.println("raw units with interest multiplier, floored =" + result);

    }/* ww  w .  j  a  v a 2 s.com*/

    // 2. Apply multiple
    int decimalPlaces = CSMiscUtils.getNumberOfDisplayDecimalPlaces(asset);
    BigDecimal display = result;
    if (decimalPlaces != 0) {
        //       System.out.println(">>>>> display = " + display.toPlainString());
        display = result.movePointLeft(decimalPlaces);
        //       System.out.println(">>>>> display = " + display.toPlainString());
    }

    //long qty = Utils.mantissaExponentToQty(qtyMantissa, qtyExponent);
    //   double multiple = asset.getMultiple();
    // let's just do it for now to make sure code is corret   
    //if (multiple != 1.0)
    //   BigDecimal m = new BigDecimal(String.valueOf(multiple));
    //   BigDecimal display = result.multiply(m);

    //System.out.println("multiplier=" + m + ", display=" + display);
    // Stripping zeros from internal zero with different scale does not work, so use 
    // JDK bug still seems to exist
    // http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6480539
    // http://stackoverflow.com/questions/5239137/clarification-on-behavior-of-bigdecimal-striptrailingzeroes
    int cmpZeroResult = display.compareTo(BigDecimal.ZERO);
    if (decimalPlaces == 0) {
        display = display.stripTrailingZeros();
    }

    // Stripping trailing zeros from internal zero with different scale does not work, so set to ZERO instead.
    if (0 == cmpZeroResult) {
        display = BigDecimal.ZERO;
    }
    return display;
}

---

From source file:it.newfammulfin.api.EntryResource.java

private <K> boolean checkAndBalanceZeroShares(final Map<K, BigDecimal> shares, BigDecimal expectedSum) {
    if (shares.isEmpty()) {
        return false;
    }/*from ww w . j av  a2 s .  com*/
    boolean equalShares = false;
    if (!Util.containsNotZero(shares.values())) {
        equalShares = true;
        expectedSum = expectedSum.setScale(Math.max(DEFAULT_SHARE_SCALE, expectedSum.scale()));
        for (Map.Entry<K, BigDecimal> shareEntry : shares.entrySet()) {
            shareEntry.setValue(expectedSum.divide(BigDecimal.valueOf(shares.size()), RoundingMode.DOWN));
        }
    }
    K largestKey = shares.keySet().iterator().next();
    for (Map.Entry<K, BigDecimal> share : shares.entrySet()) {
        if (share.getValue().abs().compareTo(shares.get(largestKey).abs()) > 0) {
            largestKey = share.getKey();
        }
    }
    BigDecimal remainder = Util.remainder(shares.values(), expectedSum);
    if (remainder.compareTo(BigDecimal.ZERO) != 0) {
        shares.put(largestKey, shares.get(largestKey).add(remainder));
    }
    return equalShares;
}

---

From source file:no.digipost.print.validate.PdfValidator.java

private double mmToPoints(final int sizeInMillimeters) {
    BigDecimal points = new BigDecimal(sizeInMillimeters * MM_TO_POINTS);
    points = points.setScale(1, RoundingMode.DOWN);
    return points.doubleValue();
}

---

From source file:org.multibit.utils.CSMiscUtils.java

public static BigInteger getRawUnitsFromDisplayString(CSAsset asset, String display) {
    BigDecimal result = null;/*from   w  w w.ja v a2  s  . co m*/
    try {
        //System.out.println("Start to get raw units from: " + display);
        result = new BigDecimal(display);
    } catch (NumberFormatException nfe) {
        nfe.printStackTrace();
        return null;
    }

    // Reverse apply the multiple
    int decimalPlaces = CSMiscUtils.getNumberOfDisplayDecimalPlaces(asset);
    if (decimalPlaces != 0) {
        result = result.movePointRight(decimalPlaces);
    }
    // FIXME: what if multiple is 0.0? ignore? error?
    //   double multiple = asset.getMultiple();
    //   BigDecimal m = new BigDecimal(String.valueOf(multiple));
    //   result = result.divide(m, MathContext.DECIMAL32);

    //System.out.println("multiplier=" + m + ", removed multiplier =" + display);

    double interestRate = asset.getInterestRate();

    BigDecimal rate = new BigDecimal(String.valueOf(interestRate));
    rate = rate.divide(new BigDecimal(100));
    rate = rate.add(BigDecimal.ONE);

    Date issueDate = asset.getIssueDate();
    DateTime d1 = new DateTime(issueDate);
    DateTime d2 = new DateTime();
    int seconds = Math.abs(Seconds.secondsBetween(d1, d2).getSeconds());

    //System.out.println("...Number of seconds difference: " + seconds);

    BigDecimal elapsedSeconds = new BigDecimal(seconds);
    BigDecimal elapsedYears = elapsedSeconds.divide(new BigDecimal(COINSPARK_SECONDS_IN_YEAR),
            MathContext.DECIMAL32);
    //System.out.println("...Number of years difference: " + elapsedYears.toPlainString());

    double base = elapsedSeconds.doubleValue();
    double exp = elapsedYears.doubleValue();
    //System.out.println("...base=" + base + "  exponent=" + exp);
    double interestMultipler = Math.pow(rate.doubleValue(), elapsedYears.doubleValue());

    //System.out.println("interest multipler =" + interestMultipler);

    result = result.divide(new BigDecimal(String.valueOf(interestMultipler)), MathContext.DECIMAL32);

    //System.out.println("result = " + result.toPlainString());

    result = result.setScale(0, RoundingMode.DOWN);
    result = result.stripTrailingZeros();

    //System.out.println("result floored = " + result.toPlainString());

    String resultString = result.toPlainString();
    return new BigInteger(resultString);
}

---

From source file:com.norconex.collector.core.crawler.AbstractCrawler.java

private void setProgress(JobStatusUpdater statusUpdater, ICrawlDataStore db) {
    int queued = db.getQueueSize();
    int processed = processedCount;
    int total = queued + processed;

    double progress = 0;

    if (total != 0) {
        progress = BigDecimal.valueOf(processed)
                .divide(BigDecimal.valueOf(total), DOUBLE_PROGRESS_SCALE, RoundingMode.DOWN).doubleValue();
    }//from  w w w.j a  va2  s.c  om
    statusUpdater.setProgress(progress);

    statusUpdater.setNote(NumberFormat.getIntegerInstance().format(processed) + " references processed out of "
            + NumberFormat.getIntegerInstance().format(total));

    if (LOG.isInfoEnabled()) {
        long currentTime = System.currentTimeMillis();
        if (currentTime - lastStatusLoggingTime > STATUS_LOGGING_INTERVAL) {
            lastStatusLoggingTime = currentTime;
            int percent = BigDecimal.valueOf(progress).movePointLeft(DOUBLE_PERCENT_SCALE).intValue();
            LOG.info(
                    getId() + ": " + percent + "% completed (" + processed + " processed/" + total + " total)");
        }
    }
}

---

From source file:org.ohmage.domain.campaign.prompt.BoundedPrompt.java

/**
 * Returns whether or not a given value is a whole number.
 * /*w w  w  .j  a  v a 2s. c o m*/
 * @param value
 *        The value to check.
 * 
 * @return True if the BigDecimal is a whole number; false, otherwise.
 */
protected boolean isWholeNumber(final BigDecimal value) {
    try {
        return value.setScale(0, RoundingMode.DOWN).compareTo(value) == 0;
    } catch (ArithmeticException e) {
        return false;
    }
}

---

• «
• 1
• 2
• 3
• 4
• 5
• »