org.knowceans.util
Class Histogram

java.lang.Object
  org.knowceans.util.Histogram

public class Histogram
extends java.lang.Object

Histogram is a static class to output histogram data graphically on an output print stream. It uses lines as columns for the bins.

Author:

gregor

Constructor Summary

Histogram()

Method Summary

static int[]	hist(double[] data, double low, double high, int bins) print histogram of the data
static double[]	hist(java.io.PrintStream out, double[] data, double low, double high, int bins, int fmax) print histogram of the data
static double[]	hist(java.io.PrintStream out, double[] data, int size) print histogram that spans the complete data set and chooses the proportion of the histogram to be good at a given size (max freqency).
static java.util.TreeMap<java.lang.Integer,java.lang.Integer>	hist(java.io.PrintStream out, int[] data, int size) Print a histogram of the categorical data.

Methods inherited from class java.lang.Object

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

Constructor Detail

Histogram

public Histogram()

Method Detail

hist

public static double[] hist(java.io.PrintStream out,
                            double[] data,
                            double low,
                            double high,
                            int bins,
                            int fmax)

print histogram of the data

Parameters:

out - stream to print to

data - vector of evidence

low - lower bin limit

high - upper bin limit

bins - # of bins

fmax - max frequency in display

Returns:

the scaled histogram bin values

hist

public static int[] hist(double[] data,
                         double low,
                         double high,
                         int bins)

print histogram of the data

Parameters:

data - vector of evidence

low - lower bin limit

high - upper bin limit

bins - # of bins

Returns:

the histogram bin counts

hist

public static double[] hist(java.io.PrintStream out,
                            double[] data,
                            int size)

print histogram that spans the complete data set and chooses the proportion of the histogram to be good at a given size (max freqency).

Parameters:

out - output stream

data - data vector

size - controls max frequency and bin number

Returns:

the scaled histogram bin values

hist

public static java.util.TreeMap<java.lang.Integer,java.lang.Integer> hist(java.io.PrintStream out,
                                                                          int[] data,
                                                                          int size)

Print a histogram of the categorical data. All categories whose frequency is zero are omitted, therefore the method returns a treemap with the non-zero frequencies (unnormalised) and not the complete interval between the min and max of the data values.

Parameters:

out -

data -

size -

Returns: