java.lang.Math.scalb()方法的使用及代码示例

x33g5p2x  于2022-01-16 转载在 其他  
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本文整理了Java中java.lang.Math.scalb()方法的一些代码示例，展示了Math.scalb()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Math.scalb()方法的具体详情如下：
包路径：java.lang.Math
类名称：Math
方法名：scalb

Math.scalb介绍

[英]Returns d * 2^ scaleFactor. The result may be rounded.
[中]返回d*2^scaleFactor。结果可以四舍五入。

代码示例

代码示例来源：origin: peter-lawrey/Java-Chronicle

  1. value += (modDiv * mod + 4) / 5;
  2. final double d = Math.scalb((double) value, exp);
  3. return negative ? -d : d;

代码示例来源：origin: google/guava

  1. /**
  2.  * Generates a number in [0, 2^numBits) with an exponential distribution. The floor of the log2 of
  3.  * the absolute value of the result is chosen uniformly at random in [0, numBits), and then the
  4.  * result is chosen from those possibilities uniformly at random.
  5.  *
  6.  * <p>Zero is treated as having log2 == 0.
  7.  */
  8. static double randomDouble(int maxExponent) {
  9.  double result = RANDOM_SOURCE.nextDouble();
  10.  result = Math.scalb(result, RANDOM_SOURCE.nextInt(maxExponent + 1));
  11.  return RANDOM_SOURCE.nextBoolean() ? result : -result;
  12. }

代码示例来源：origin: apache/incubator-druid

  1. @Override
  2.  protected ExprEval eval(ExprEval x, ExprEval y)
  3.  {
  4.   return ExprEval.of(Math.scalb(x.asDouble(), y.asInt()));
  5.  }
  6. }

代码示例来源：origin: google/guava

  1. @GwtIncompatible // DoubleMath.log2(double, RoundingMode)
  2. public void testRoundLog2Half() {
  3.  // We don't expect perfect rounding accuracy.
  4.  for (int exp : asList(-1022, -50, -1, 0, 1, 2, 3, 4, 100, 1022, 1023)) {
  5.   for (RoundingMode mode : asList(HALF_EVEN, HALF_UP, HALF_DOWN)) {
  6.    double x = Math.scalb(Math.sqrt(2) + 0.001, exp);
  7.    double y = Math.scalb(Math.sqrt(2) - 0.001, exp);
  8.    if (exp < 0) {
  9.     assertEquals(exp + 1, DoubleMath.log2(x, mode));
  10.     assertEquals(exp, DoubleMath.log2(y, mode));
  11.    } else {
  12.     assertEquals(exp + 1, DoubleMath.log2(x, mode));
  13.     assertEquals(exp, DoubleMath.log2(y, mode));
  14.    }
  15.   }
  16.  }
  17. }

代码示例来源：origin: addthis/stream-lib

  1. for (int j = 0; j < registerSet.count; j++) {
  2.   int val = registerSet.get(j);
  3.   registerSum += Math.scalb(1d, -val);
  4.   if (val == 0) {
  5.     zeros++;

代码示例来源：origin: google/guava

  1. @GwtIncompatible // DoubleMath.log2(double, RoundingMode)
  2. public void testRoundLog2Exact() {
  3.  for (double x : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
  4.   boolean isPowerOfTwo = StrictMath.pow(2.0, DoubleMath.log2(x, FLOOR)) == x;
  5.   try {
  6.    int log2 = DoubleMath.log2(x, UNNECESSARY);
  7.    assertEquals(x, Math.scalb(1.0, log2));
  8.    assertTrue(isPowerOfTwo);
  9.   } catch (ArithmeticException e) {
  10.    assertFalse(isPowerOfTwo);
  11.   }
  12.  }
  13. }

代码示例来源：origin: com.netflix.sstableadaptor/sstable-adaptor-cassandra

  1. @Override
  2. public double size(Token next)
  3. {
  4.   LongToken n = (LongToken) next;
  5.   long v = n.token - token;  // Overflow acceptable and desired.
  6.   double d = Math.scalb((double) v, -Long.SIZE); // Scale so that the full range is 1.
  7.   return d > 0.0 ? d : (d + 1.0); // Adjust for signed long, also making sure t.size(t) == 1.
  8. }

代码示例来源：origin: org.apache.cassandra/cassandra-all

  1. @Override
  2. public double size(Token next)
  3. {
  4.   LongToken n = (LongToken) next;
  5.   long v = n.token - token;  // Overflow acceptable and desired.
  6.   double d = Math.scalb((double) v, -Long.SIZE); // Scale so that the full range is 1.
  7.   return d > 0.0 ? d : (d + 1.0); // Adjust for signed long, also making sure t.size(t) == 1.
  8. }

代码示例来源：origin: jsevellec/cassandra-unit

  1. @Override
  2. public double size(Token next)
  3. {
  4.   LongToken n = (LongToken) next;
  5.   long v = n.token - token;  // Overflow acceptable and desired.
  6.   double d = Math.scalb((double) v, -Long.SIZE); // Scale so that the full range is 1.
  7.   return d > 0.0 ? d : (d + 1.0); // Adjust for signed long, also making sure t.size(t) == 1.
  8. }

代码示例来源：origin: com.github.haifengl/smile-math

  1. /**
  2.  * Returns d x 2<sup>scaleFactor</sup> rounded as if performed by a single
  3.  * correctly rounded floating-point multiply to a member of the double value
  4.  * set. 
  5.  */
  6. public static double scalb(double d, int scaleFactor) {
  7.   return java.lang.Math.scalb(d, scaleFactor);
  8. }

代码示例来源：origin: com.github.haifengl/smile-math

  1. /**
  2.  * Returns f x 2<sup>scaleFactor</sup> rounded as if performed by a single
  3.  * correctly rounded floating-point multiply to a member of the float value
  4.  * set.
  5.  */
  6. public static float scalb(float f, int scaleFactor) {
  7.   return java.lang.Math.scalb(f, scaleFactor);
  8. }

代码示例来源：origin: jsevellec/cassandra-unit

  1. public double size(Token next)
  2.   {
  3.     BigIntegerToken n = (BigIntegerToken) next;
  4.     BigInteger v = n.token.subtract(token);  // Overflow acceptable and desired.
  5.     double d = Math.scalb(v.doubleValue(), -127); // Scale so that the full range is 1.
  6.     return d > 0.0 ? d : (d + 1.0); // Adjust for signed long, also making sure t.size(t) == 1.
  7.   }
  8. }

代码示例来源：origin: org.apache.cassandra/cassandra-all

  1. public double size(Token next)
  2.   {
  3.     BigIntegerToken n = (BigIntegerToken) next;
  4.     BigInteger v = n.token.subtract(token);  // Overflow acceptable and desired.
  5.     double d = Math.scalb(v.doubleValue(), -127); // Scale so that the full range is 1.
  6.     return d > 0.0 ? d : (d + 1.0); // Adjust for signed long, also making sure t.size(t) == 1.
  7.   }
  8. }

代码示例来源：origin: geogebra/geogebra

  1. /** {@inheritDoc} */
  2. public SparseGradient scalb(final int n) {
  3.   final SparseGradient out = new SparseGradient(Math.scalb(value, n), Collections.<Integer, Double> emptyMap());
  4.   for (Map.Entry<Integer, Double> entry : derivatives.entrySet()) {
  5.     out.derivatives.put(entry.getKey(), Math.scalb(entry.getValue(), n));
  6.   }
  7.   return out;
  8. }

代码示例来源：origin: geogebra/geogebra

  1. /** {@inheritDoc}
  2.  * @since 3.2
  3.  */
  4. public DerivativeStructure scalb(final int n) {
  5.   final DerivativeStructure ds = new DerivativeStructure(compiler);
  6.   for (int i = 0; i < ds.data.length; ++i) {
  7.     ds.data[i] = Math.scalb(data[i], n);
  8.   }
  9.   return ds;
  10. }

代码示例来源：origin: geogebra/geogebra

  1. /** {@inheritDoc}
  2.  * @since 3.2
  3.  */
  4. public Decimal64 scalb(final int n) {
  5.   return new Decimal64(Math.scalb(value, n));
  6. }

代码示例来源：origin: org.apache.sis.core/sis-utility

  1. /**
  2.  * Returns {@code true} if the given floating point numbers are considered equal.
  3.  * The tolerance factor used in this method is arbitrary and may change in any future version.
  4.  */
  5. static boolean epsilonEquals(final double expected, final double actual) {
  6.   return Math.abs(expected - actual) <= Math.scalb(Math.ulp(expected), 4);
  7. }

代码示例来源：origin: org.python/jython

  1. public static double ldexp(double v, PyObject wObj) {
  2.   long w = getLong(wObj);
  3.   if (w < Integer.MIN_VALUE) {
  4.     w = Integer.MIN_VALUE;
  5.   } else if (w > Integer.MAX_VALUE) {
  6.     w = Integer.MAX_VALUE;
  7.   }
  8.   return exceptInf(Math.scalb(v, (int)w), v);
  9. }

代码示例来源：origin: org.apache.druid/druid-common

  1. @Override
  2.  protected ExprEval eval(ExprEval x, ExprEval y)
  3.  {
  4.   return ExprEval.of(Math.scalb(x.asDouble(), y.asInt()));
  5.  }
  6. }

代码示例来源：origin: org.ballerinalang/ballerina-math

  1. public void execute(Context ctx) {
  2.     double a = ctx.getFloatArgument(0);
  3.     long b = ctx.getIntArgument(0);
  4.     int intVal = ((Long) b).intValue();
  5.     ctx.setReturnValues(new BFloat(Math.scalb(a, intVal)));
  6.   }
  7. }

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