Java Utililty Methods Number Power

List of utility methods to do Number Power

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Description

The list of methods to do Number Power are organized into topic(s).

Method

intpow2(int c)
pow 
assert c > 0;
c--;
c |= c >> 1;
c |= c >> 2;
c |= c >> 4;
c |= c >> 8;
c |= c >> 16;
c++;
...
intpow2(int i)
2^i 
if (i < 0)
    return 0;
int result = 1;
for (int k = 0; k < i; k++)
    result *= 2;
return result;
longpow2(long x)
Calculates 2 in power of integer value x 
long result = 1;
for (long i = 1; i <= x; i++) {
    result *= 2;
return result;
voidPow2(Object in, double val)
Pow 
if (in == null)
    return;
if (in instanceof double[]) {
    double[] inn = (double[]) in;
    for (int i = 0, s = inn.length; i < s; i++)
        inn[i] = (Sign(inn[i]) * Math.pow(inn[i], val));
} else {
    for (int i = 0, s = ((Object[]) in).length; i < s; i++)
...
bytepow2ByteIndex(final int x)
pow Byte Index 
if (x < 0 || x > 7)
    throw new IllegalArgumentException(
            "Unsupported Value [" + x + "]. Only supported for values between 0 and 30 inclusive");
return BYTEPOW2[x];
floatpow3_strict(final float a)
Strict version. 
return a * a * a;
doublepow4(double val)
Convenience function to compute the fourth power of a value 
return val * val * val * val;
doublepow9(final double x)
pow 
return x * x * x * x * x * x * x * x * x;
doublepowDecay(double x, double y)
pow Decay 
int num, den = 1001, s = 0;
double n = x, z = Double.MAX_VALUE;
for (int i = 1; i < s; i++)
    n *= x;
while (z >= Double.MAX_VALUE) {
    den -= 1;
    num = (int) (y * den);
    s = (num / den) + 1;
...
doublepower(double d, int exp)
power 
double r = 1;
for (int x = 0; x < exp; x++) {
    r *= d;
return r;