org.das2.util
Class DasMath

java.lang.Object
  org.das2.util.DasMath

public class DasMath
extends java.lang.Object

Constructor Summary

DasMath()
Creates a new instance of DasMath

Method Summary

static double	biggerOf(double x1, double x2)
static double	exp10(double x)
static double	exp10(int x)
static double[]	findex(double[] datax, double[] x) Returns the "floating point indeces" of x within array datax.
static double	findex(double[] datax, double x, int guess)
static double	gcd(double[] A, double error)
static double	interpolate(double[] datay, double findex) Interpolate just one point
static double[]	interpolate(double[] datay, double[] findex) interpolate an array of points.
static double	log10(double x)
static void	main(java.lang.String[] args)
static double	max(double[] A)
static double	mean(double[] A)
static double	median(double[] A)
static double	min(double[] A)
static double	modp(double x, double t) just like modulo (%) function, but negative numbers return positive phase.
static int	modp(int x, int t) just like modulo (%) function, but negative numbers return positive phase.
static double	roundNFractionalDigits(double x, int n)
static double	roundNSignificantDigits(double x, int n)
static double[]	sort(double[] A)
static double	tanh(double x)

Methods inherited from class java.lang.Object

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

Constructor Detail

DasMath

public DasMath()

Creates a new instance of DasMath

Method Detail

log10

public static double log10(double x)

exp10

public static double exp10(double x)

exp10

public static double exp10(int x)

roundNFractionalDigits

public static double roundNFractionalDigits(double x,
                                            int n)

roundNSignificantDigits

public static double roundNSignificantDigits(double x,
                                             int n)

tanh

public static double tanh(double x)

interpolate

public static double interpolate(double[] datay,
                                 double findex)

Interpolate just one point

interpolate

public static double[] interpolate(double[] datay,
                                   double[] findex)

interpolate an array of points.

findex

public static double[] findex(double[] datax,
                              double[] x)

Returns the "floating point indeces" of x within array datax. A floating point index (or "findex") indicates the indeces of the points that bracket and the weights of each bracketing point to use. A findex of 4.5 indicates that x is half-way between index 4 and 5, so equal weights should be used. floor( findex ) is the "left" bracket, ceil(findex) is the "right" bracket, and fp( findex ) is the weight for the right bracket. See interpolate for an example of its use.

findex

public static final double findex(double[] datax,
                                  double x,
                                  int guess)

main

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

modp

public static double modp(double x,
                          double t)

just like modulo (%) function, but negative numbers return positive phase.

modp

public static int modp(int x,
                       int t)

just like modulo (%) function, but negative numbers return positive phase.

biggerOf

public static double biggerOf(double x1,
                              double x2)

gcd

public static double gcd(double[] A,
                         double error)

mean

public static double mean(double[] A)

median

public static double median(double[] A)

max

public static double max(double[] A)

min

public static double min(double[] A)

sort

public static double[] sort(double[] A)