本文整理了Java中java.lang.Math.expm1()方法的一些代码示例，展示了Math.expm1()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.expm1()方法的具体详情如下：
包路径：java.lang.Math
类名称：Math
方法名：expm1
[英]Returns the closest double approximation of e d - 1. If the argument is very close to 0, it is much more accurate to use expm1(d)+1 than exp(d) (due to cancellation of significant digits). The returned result is within 1 ulp (unit in the last place) of the real result.
For any finite input, the result is not less than -1.0. If the real result is within 0.5 ulp of -1, -1.0 is returned.
Special cases:
代码示例来源：origin: apache/incubator-druid
@Override
protected ExprEval eval(double param)
{
return ExprEval.of(Math.expm1(param));
}
}代码示例来源：origin: DataSketches/sketches-core
/**
* Important note: do not change anything in the following function.
* It has been carefully designed and tested for numerical accuracy.
* In particular, the use of log1p and expm1 is critically important.
* @param kf the value of k as a double
* @param nf the value of n as a double
* @param col the given column
* @return the quantity qnj
*/
static double qnj(final double kf, final double nf, final int col) {
final double tmp1 = -1.0 / (kf * (Math.pow(2.0, col)));
final double tmp2 = Math.log1p(tmp1);
return (-1.0 * (Math.expm1(nf * tmp2)));
}代码示例来源：origin: com.github.haifengl/smile-math
/**
* Returns e<sup>x</sup>-1.
*/
public static double expm1(double x) {
return java.lang.Math.expm1(x);
}代码示例来源：origin: net.objecthunter/exp4j
@Override
public double apply(double... args) {
return Math.expm1(args[0]);
}
};代码示例来源：origin: org.apache.commons/math
/** {@inheritDoc} */
@Override
public RealVector mapExpm1ToSelf() {
for (int i = 0; i < data.length; i++) {
data[i] = Math.expm1(data[i]);
}
return this;
}代码示例来源：origin: org.apache.commons/math
/** {@inheritDoc} */
@Override
public double value(double d) {
return Math.expm1(d);
}
};代码示例来源：origin: jpmml/jpmml-evaluator
@Override
public Double evaluate(Number value){
return Math.expm1(value.doubleValue());
}
};代码示例来源：origin: ca.umontreal.iro/ssj
protected void initArrays(int d) {
double dt, c;
for (int j = 0; j < d; j++) {
dt = t[j+1] - t[j];
c = -Math.expm1(-alpha * dt)*sigma*sigma/(4.0*alpha);
parc[j] = c;
parlam[j] = Math.exp(-alpha * dt) / c;
}
}代码示例来源：origin: geogebra/geogebra
/**
* {@inheritDoc}
*
* For scale {@code m} and shape {@code s}, the variance is
* {@code (exp(s^2) - 1) * exp(2 * m + s^2)}.
*/
public double getNumericalVariance() {
final double s = shape;
final double ss = s * s;
return (Math.expm1(ss)) * Math.exp(2 * scale + ss);
}代码示例来源：origin: pravega/pravega
private double calculateExponential(double result) {
if (!logarithmicWeighting) {
return result;
}
return Math.signum(result) * (Math.expm1(Math.abs(result)));
}代码示例来源：origin: OpenGamma/Strata
/**
* This is the Taylor expansion of $$\frac{\exp(x)-1}{x}$$ - note for $$|x| > 10^{-10}$$ the expansion is note used .
*
* @param x the value
* @return the result
*/
public static double epsilon(double x) {
if (Math.abs(x) > 1e-10) {
return Math.expm1(x) / x;
}
return taylor(x, COEFF1);
}代码示例来源：origin: ca.umontreal.iro/ssj
private static double invGaver (int n, double u) {
// Gaver-Kafadar normal approximation for the inverse
// \cite{tGAV84a}
double z = NormalDist.inverseF01 (u);
double q = z / (n - 1.0);
double v = q * q * (n - 1.5);
double t = Math.sqrt(n * Math.expm1(v));
if (u >= 0.5)
return t;
else
return -t;
}代码示例来源：origin: OpenGamma/Strata
/**
* This is the Taylor expansion of the first derivative of $$\frac{\exp(x)-1}{x}$$.
*
* @param x the value
* @return the result
*/
public static double epsilonP(double x) {
if (Math.abs(x) > 1e-7) {
return ((x - 1) * Math.expm1(x) + x) / x / x;
}
return taylor(x, COEFF2);
}代码示例来源：origin: org.python/jython
public static double expm1(double v) {
if (Double.POSITIVE_INFINITY == v) {
return v;
}
double result = Math.expm1(v);
if (Double.isInfinite(result)) {
throw Py.OverflowError(Double.toString(v));
}
return result;
}代码示例来源：origin: geogebra/geogebra
/** {@inheritDoc}
* @since 3.2
*/
public Decimal64 expm1() {
return new Decimal64(Math.expm1(value));
}代码示例来源：origin: org.apache.druid/druid-common
@Override
protected ExprEval eval(double param)
{
return ExprEval.of(Math.expm1(param));
}
}代码示例来源：origin: uk.org.retep.tools/math
@Override
public Object expm1( final MonadicOp op )
throws MathematicsException
{
return Math.expm1( visitNumber( op.getValue() ).doubleValue() );
}代码示例来源：origin: net.imglib2/imglib2-script
@Override
public final double eval() {
return Math.expm1(a().eval());
}
}代码示例来源：origin: algorithmfoundry/Foundry
@Override
public double getVariance()
{
double exp1 = this.getLogNormalVariance();
double exp2 = 2.0 * this.getLogNormalMean() + this.getLogNormalVariance();
// (Math.exp(exp1)-1)*Math.exp(exp2)
return (Math.expm1( exp1 ) * Math.exp( exp2 ));
}代码示例来源：origin: gov.sandia.foundry/gov-sandia-cognition-learning-core
@Override
public double getVariance()
{
double exp1 = this.getLogNormalVariance();
double exp2 = 2.0 * this.getLogNormalMean() + this.getLogNormalVariance();
// (Math.exp(exp1)-1)*Math.exp(exp2)
return (Math.expm1( exp1 ) * Math.exp( exp2 ));
}内容来源于网络，如有侵权，请联系作者删除！