math.jwave.tools

Class AncientEgyptianMultiplication

java.lang.Object

math.jwave.tools.AncientEgyptianMultiplication

public class AncientEgyptianMultiplication
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
AncientEgyptianMultiplication() Some how useless ~8>

Method Summary

Modifier and Type	Method and Description
int	compose(int[] ancientEgyptianMultipliers) The method converts a list of ancient Egyptian multipliers to the corresponding integer.
int[]	decompose(int number) The method converts a positive integer to the ancient Egyptian multipliers which are actually the multipliers to display the number by a sum of the largest possible powers of two.
int	getExponent(double f) Replaced Math.getExponent due to google's Android OS is not supporting it in Math library.
double	scalb(double f, int scaleFactor) Replaced Math.scalb due to google's Android OS is not supporting it in Math library.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AncientEgyptianMultiplication

public AncientEgyptianMultiplication()

Some how useless ~8>

Method Detail

decompose

public int[] decompose(int number)
                throws JWaveException

The method converts a positive integer to the ancient Egyptian multipliers which are actually the multipliers to display the number by a sum of the largest possible powers of two. E.g. 42 = 2^5 + 2^3 + 2^1 = 32 + 8 + 2. However, odd numbers always 2^0 = 1 as the last entry. Also see: http://en.wikipedia.org/wiki/Ancient_Egyptian_multiplication

Parameters:

number -

Returns:

Throws:

JWaveException

compose

public int compose(int[] ancientEgyptianMultipliers)
            throws JWaveException

The method converts a list of ancient Egyptian multipliers to the corresponding integer. The ancient Egyptian multipliers are actually the multipliers to display am integer by a sum of the largest possible powers of two. E.g. 42 = 2^5 + 2^3 + 2^1 = 32 + 8 + 2. Also see: http://en.wikipedia.org/wiki/Ancient_Egyptian_multiplication

Parameters:

ancientEgyptianMultipliers - an integer array keeping the ancient Egyptian multipliers

Returns:

resulting integer as sum of powers of two

Throws:

JWaveException

getExponent

public int getExponent(double f)

Replaced Math.getExponent due to google's Android OS is not supporting it in Math library.

Parameters:

f -

Returns:

p of 2^p <= f < 2^(p+1)

scalb

public double scalb(double f,
                    int scaleFactor)

Replaced Math.scalb due to google's Android OS is not supporting it in Math library.

Parameters:

f -

scaleFactor -

Returns:

f times 2^(scaleFactor)