de.lmu.ifi.dbs.elki.math

Class SinCosTable.QuarterTable

java.lang.Object

de.lmu.ifi.dbs.elki.math.SinCosTable

de.lmu.ifi.dbs.elki.math.SinCosTable.QuarterTable

Enclosing class:

SinCosTable

private static class SinCosTable.QuarterTable
extends SinCosTable

Table that exploits both symmetries, as the number of steps is divisible by four.

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
private double[]	costable Data store
private int	halfsteps Number of steps div 2
private int	quarsteps Number of steps div 4

Fields inherited from class de.lmu.ifi.dbs.elki.math.SinCosTable

steps

Constructor Summary

Constructors

Constructor and Description
QuarterTable(int steps) Constructor for tables with

Method Summary

Modifier and Type	Method and Description
double	cos(int step) Get Cosine by step value.
double	sin(int step) Get Sinus by step value.

Methods inherited from class de.lmu.ifi.dbs.elki.math.SinCosTable

make

Methods inherited from class java.lang.Object

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

Field Detail

quarsteps

private final int quarsteps

Number of steps div 4

halfsteps

private final int halfsteps

Number of steps div 2

costable

private final double[] costable

Data store

Constructor Detail

QuarterTable

public QuarterTable(int steps)

Constructor for tables with

Parameters:

steps -

Method Detail

cos

public double cos(int step)

Get Cosine by step value.

Specified by:

cos in class SinCosTable

Parameters:

step - Step value

Returns:

Cosinus

sin

public double sin(int step)

Get Sinus by step value.

Specified by:

sin in class SinCosTable

Parameters:

step - Step value

Returns:

Sinus