cds.tools.pixtools
Class BitManipulation

java.lang.Object
  cds.tools.pixtools.BitManipulation

public class BitManipulation
extends java.lang.Object

bit manipulation class derived from Healpix fortran90 program.

Author:

N Kuropatkin

Field Summary

static long	magic1 magic1 odd bits set constant
static long	magic2 magic2 - even bits set constant

Constructor Summary

BitManipulation()
default constructor

Method Summary

long	invLSB(long i) returns i with even bits inverted
long	invMSB(long i) returns i with odd bits inverted
long	invswapLSBMSB(long i) returns NOT i with even and odd bit positions interchanged
static void	main(java.lang.String[] pars) the main program for simple test
double	MODULO(double a, double b) simulates behaviour of fortran90 MODULO function
long	swapLSBMSB(long i) swaps low and high bits in the word i

Methods inherited from class java.lang.Object

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

Field Detail

magic1

public static long magic1

magic1 odd bits set constant

magic2

public static long magic2

magic2 - even bits set constant

Constructor Detail

BitManipulation

public BitManipulation()

default constructor

Method Detail

swapLSBMSB

public long swapLSBMSB(long i)

swaps low and high bits in the word i

Parameters:

i - integer input word

Returns:

int a word with odd and even bits interchanged

invswapLSBMSB

public long invswapLSBMSB(long i)

returns NOT i with even and odd bit positions interchanged

Parameters:

i - int input word

Returns:

int NOT (i with LSBMSB)

invLSB

public long invLSB(long i)

returns i with even bits inverted

Parameters:

i - int input word

Returns:

int word with modified bits

invMSB

public long invMSB(long i)

returns i with odd bits inverted

Parameters:

i - int input word

Returns:

int word with modified bits

MODULO

public double MODULO(double a,
                     double b)

simulates behaviour of fortran90 MODULO function

Parameters:

a - double

b - double

Returns:

double MODULO

main

public static void main(java.lang.String[] pars)

the main program for simple test

Parameters:

pars -