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Java Math.exp方法代碼示例

本文整理匯總了Java中java.lang.Math.exp方法的典型用法代碼示例。如果您正苦於以下問題：Java Math.exp方法的具體用法？Java Math.exp怎麽用？Java Math.exp使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類java.lang.Math的用法示例。


在下文中一共展示了Math.exp方法的10個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。

示例1: k

import java.lang.Math; //導入方法依賴的package包/類
@Override
public double k(int[] x, int[] y) {
    double d = 0.0;

    int p1 = 0, p2 = 0;
    while (p1 < x.length && p2 < y.length) {
        int i1 = x[p1];
        int i2 = y[p2];
        if (i1 == i2) {
            p1++;
            p2++;
        } else if (i1 > i2) {
            d++;
            p2++;
        } else {
            d++;
            p1++;
        }
    }

    d += x.length - p1;
    d += y.length - p2;

    return Math.exp(-gamma * d);
}
開發者ID:takun2s，項目名稱:smile_1.5.0_java7，代碼行數:26，代碼來源:BinarySparseGaussianKernel.java

示例2: k

import java.lang.Math; //導入方法依賴的package包/類
@Override
public double k(int[] x, int[] y) {
    if (x.length != y.length)
        throw new IllegalArgumentException(String.format("Arrays have different length: x[%d], y[%d]", x.length, y.length));

    double d = 0.0;
    int p1 = 0, p2 = 0;
    while (p1 < x.length && p2 < y.length) {
        int i1 = x[p1];
        int i2 = y[p2];
        if (i1 == i2) {
            p1++;
            p2++;
        } else if (i1 > i2) {
            d++;
            p2++;
        } else {
            d++;
            p1++;
        }
    }

    d += x.length - p1;
    d += y.length - p2;

    return Math.exp(-gamma * Math.sqrt(d));
}
開發者ID:takun2s，項目名稱:smile_1.5.0_java7，代碼行數:28，代碼來源:BinarySparseLaplacianKernel.java

示例3: cosh

import java.lang.Math; //導入方法依賴的package包/類
/**
 * Cosh double.
 *
 * @param x a double value
 * @return the hyperbolic cosine of the argument
 * @throws ArithmeticException the arithmetic exception
 */
static public double cosh(double x) throws ArithmeticException {
    double a;
    a = x;
    if( a < 0.0 ) a = Math.abs(x);
    a = Math.exp(a);
    return 0.5*(a+1/a);
}
開發者ID:RudyB，項目名稱:Optics-Simulator，代碼行數:15，代碼來源:SpecialFunction.java

示例4: sinh

import java.lang.Math; //導入方法依賴的package包/類
/**
 * Sinh double.
 *
 * @param x a double value
 * @return the hyperbolic sine of the argument
 * @throws ArithmeticException the arithmetic exception
 */
static public double sinh(double x) throws ArithmeticException {
    double a;
    if(x == 0.0) return x;
    a = x;
    if( a < 0.0 ) a = Math.abs(x);
    a = Math.exp(a);
    if( x < 0.0 )  return -0.5*(a-1/a);
    else           return  0.5*(a-1/a);
}
開發者ID:RudyB，項目名稱:Optics-Simulator，代碼行數:17，代碼來源:SpecialFunction.java

示例5: tanh

import java.lang.Math; //導入方法依賴的package包/類
/**
 * Tanh double.
 *
 * @param x a double value
 * @return the hyperbolic tangent of the argument
 * @throws ArithmeticException the arithmetic exception
 */
static public double tanh(double x) throws ArithmeticException {
    double a;
    if( x == 0.0 ) return x;
    a = x;
    if( a < 0.0 ) a = Math.abs(x);
    a = Math.exp(2.0*a);
    if(x < 0.0 ) return -( 1.0-2.0/(a+1.0) );
    else         return  ( 1.0-2.0/(a+1.0) );
}
開發者ID:RudyB，項目名稱:Optics-Simulator，代碼行數:17，代碼來源:SpecialFunction.java

示例6: stirf

import java.lang.Math; //導入方法依賴的package包/類
/**
     * Stirf double.
     *
     * @param x the x
     * @return the double
     * @throws ArithmeticException the arithmetic exception
     */
/* Gamma function computed by Stirling's formula.
     * The polynomial STIR is valid for 33 <= x <= 172.

    Cephes Math Library Release 2.2:  July, 1992
    Copyright 1984, 1987, 1989, 1992 by Stephen L. Moshier
    Direct inquiries to 30 Frost Street, Cambridge, MA 02140
    */
    static private double stirf(double x) throws ArithmeticException {
        double STIR[] = {
                7.87311395793093628397E-4,
                -2.29549961613378126380E-4,
                -2.68132617805781232825E-3,
                3.47222221605458667310E-3,
                8.33333333333482257126E-2,
        };
        double MAXSTIR = 143.01608;

        double w = 1.0/x;
        double  y = Math.exp(x);

        w = 1.0 + w * polevl( w, STIR, 4 );

        if( x > MAXSTIR ) {
	       /* Avoid overflow in Math.pow() */
            double v = Math.pow( x, 0.5 * x - 0.25 );
            y = v * (v / y);
        } else {
            y = Math.pow( x, x - 0.5 ) / y;
        }
        y = SQTPI * y * w;
        return y;
    }
開發者ID:RudyB，項目名稱:Optics-Simulator，代碼行數:40，代碼來源:SpecialFunction.java

示例7: igam

import java.lang.Math; //導入方法依賴的package包/類
/**
 * Igam double.
 *
 * @param a double value
 * @param x double value
 * @return the Incomplete Gamma function.  Converted to Java from<BR> Cephes Math Library Release
 * 2.2:  July, 1992<BR> Copyright 1984, 1987, 1989, 1992 by Stephen L. Moshier<BR> Direct inquiries to 30 Frost
 * Street, Cambridge, MA 02140<BR>
 * @throws ArithmeticException the arithmetic exception
 */
static public double igam(double a, double x)
        throws ArithmeticException {


    double ans, ax, c, r;

    if( x <= 0 || a <= 0 ) return 0.0;

    if( x > 1.0 && x > a ) return 1.0 - igamc(a,x);

   /* Compute  x**a * exp(-x) / gamma(a)  */
    ax = a * Math.log(x) - x - lgamma(a);
    if( ax < -MAXLOG ) return( 0.0 );

    ax = Math.exp(ax);

    /* power series */
    r = a;
    c = 1.0;
    ans = 1.0;

    do {
        r += 1.0;
        c *= x/r;
        ans += c;
    }
    while( c/ans > MACHEP );

    return( ans * ax/a );

}
開發者ID:RudyB，項目名稱:Optics-Simulator，代碼行數:42，代碼來源:SpecialFunction.java

示例8: pseries

import java.lang.Math; //導入方法依賴的package包/類
/**
 * Pseries double.
 *
 * @param a the a
 * @param b the b
 * @param x the x
 * @return the double
 * @throws ArithmeticException the arithmetic exception
 */
static private  double pseries( double a, double b, double x )
        throws ArithmeticException {
    double s, t, u, v, n, t1, z, ai;

    ai = 1.0 / a;
    u = (1.0 - b) * x;
    v = u / (a + 1.0);
    t1 = v;
    t = u;
    n = 2.0;
    s = 0.0;
    z = MACHEP * ai;
    while( Math.abs(v) > z ) {
        u = (n - b) * x / n;
        t *= u;
        v = t / (a + n);
        s += v;
        n += 1.0;
    }
    s += t1;
    s += ai;

    u = a * Math.log(x);
    if( (a+b) < MAXGAM && Math.abs(u) < MAXLOG ) {
        t = gamma(a+b)/(gamma(a)*gamma(b));
        s = s * t * Math.pow(x,a);
    } else {
        t = lgamma(a+b) - lgamma(a) - lgamma(b) + u + Math.log(s);
        if( t < MINLOG ) 	s = 0.0;
        else  	            s = Math.exp(t);
    }
    return s;
}
開發者ID:RudyB，項目名稱:Optics-Simulator，代碼行數:43，代碼來源:SpecialFunction.java

示例9: doNonlinearity

import java.lang.Math; //導入方法依賴的package包/類
private float doNonlinearity(float x) {
  if (nonlinearity.equals("relu")) {
    return x < 0 ? 0 : x;
  } else if (nonlinearity.equals("sigmoid")) {
    return (float)(1 / (1 + Math.exp(-x)));
  } else {
    return x;
  }
}
開發者ID:airalcorn2，項目名稱:RankNet，代碼行數:10，代碼來源:RankNet.java

示例10: igamc

import java.lang.Math; //導入方法依賴的package包/類
/**
 * Igamc double.
 *
 * @param a double value
 * @param x double value
 * @return the Complemented Incomplete Gamma function.Converted to Java from<BR> Cephes Math
 * Library Release 2.2:  July, 1992<BR> Copyright 1984, 1987, 1989, 1992 by Stephen L. Moshier<BR> Direct inquiries
 * to 30 Frost Street, Cambridge, MA 02140<BR>
 * @throws ArithmeticException the arithmetic exception
 */
static public double igamc( double a, double x )
        throws ArithmeticException {
    double big    = 4.503599627370496e15;
    double biginv =  2.22044604925031308085e-16;
    double ans, ax, c, yc, r, t, y, z;
    double pk, pkm1, pkm2, qk, qkm1, qkm2;

    if( x <= 0 || a <= 0 ) return 1.0;

    if( x < 1.0 || x < a ) return 1.0 - igam(a,x);

    ax = a * Math.log(x) - x - lgamma(a);
    if( ax < -MAXLOG ) return 0.0;

    ax = Math.exp(ax);

    /* continued fraction */
    y = 1.0 - a;
    z = x + y + 1.0;
    c = 0.0;
    pkm2 = 1.0;
    qkm2 = x;
    pkm1 = x + 1.0;
    qkm1 = z * x;
    ans = pkm1/qkm1;

    do {
        c += 1.0;
        y += 1.0;
        z += 2.0;
        yc = y * c;
        pk = pkm1 * z  -  pkm2 * yc;
        qk = qkm1 * z  -  qkm2 * yc;
        if( qk != 0 ) {
            r = pk/qk;
            t = Math.abs( (ans - r)/r );
            ans = r;
        } else
            t = 1.0;

        pkm2 = pkm1;
        pkm1 = pk;
        qkm2 = qkm1;
        qkm1 = qk;
        if( Math.abs(pk) > big ) {
            pkm2 *= biginv;
            pkm1 *= biginv;
            qkm2 *= biginv;
            qkm1 *= biginv;
        }
    } while( t > MACHEP );

    return ans * ax;
}
開發者ID:RudyB，項目名稱:Optics-Simulator，代碼行數:65，代碼來源:SpecialFunction.java


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