stella.merit

Class AtTimeMerit

java.lang.Object

util.PropertyContainer

stella.merit.AbstractMerit

stella.merit.AtTimeMerit

All Implemented Interfaces:

Serializable, Cloneable, Meriting, PropertySupplying

public class AtTimeMerit
extends AbstractMerit

A class defining a time-slot merit that peaks around a given date. The formula used is, see .

 ts(t)=(2n)^-1/2n*exp(-1/2n)*x^1/n·exp(-x^2),
 x=(t-(t0-trise))/sqr(2n)·trise.
 

The first factor normalizes the merit to one for t=t0. Before t0-trise a merit of zero is returned.

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Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static double	DEFRISE Default value for the rise time, twelve hours.
private static int	DEFSHARP Default value for the sharpness.
private static String	DEFTIME Default time parameter name.
static String	KEY_RISE The key linked to the time merit rises from zero to peak.
static String	KEY_SHARP The sharpness of the rise, i.e.
static String	KEY_T0 The key linked to the time when merit peaks.
static String	KEY_TIME The key pointing to the name of the time parameter.
private double	scale To return a mximum merit of one.
private double	sigma The scaling factor for the time.
private double	x0 The zero time when the merit is zero.

Fields inherited from class util.PropertyContainer

KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface util.PropertySupplying

CONFIG, KEY_CLASS

Constructor Summary

Constructors

Constructor and Description
AtTimeMerit(Map<String,String> prop) Constructs a at-time merit starting at the current time and with a default risetime (DEFRISE) and sharpness (DEFSHARP .

Method Summary

Modifier and Type	Method and Description
double	getMerit(GlobalGrouping set, Appointable target, Collection<Appointable> ignore, long spms) Calculates the actual time slot merit.

Methods inherited from class stella.merit.AbstractMerit

createMerit, getInitializer, initMerit

Methods inherited from class util.PropertyContainer

augment, augment, augment, augment, augment, clone, defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsEnums, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, initProperties, isNew, parseObject, parseObject, reload, reload, removeProperty, requires, rescanned, setObject, setProperties, setProperty, stringProperties, toString

Methods inherited from class java.lang.Object

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

Field Detail

KEY_T0

public static final String KEY_T0

The key linked to the time when merit peaks.

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Constant Field Values

KEY_RISE

public static final String KEY_RISE

The key linked to the time merit rises from zero to peak.

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Constant Field Values

KEY_SHARP

public static final String KEY_SHARP

The sharpness of the rise, i.e. n .

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Constant Field Values

KEY_TIME

public static final String KEY_TIME

The key pointing to the name of the time parameter.

See Also:

Constant Field Values

DEFRISE

private static final double DEFRISE

Default value for the rise time, twelve hours.

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Constant Field Values

DEFSHARP

private static final int DEFSHARP

Default value for the sharpness.

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Constant Field Values

DEFTIME

private static final String DEFTIME

Default time parameter name.

See Also:

Constant Field Values

x0

private final double x0

The zero time when the merit is zero.

sigma

private final double sigma

The scaling factor for the time.

scale

private final double scale

To return a mximum merit of one.

Constructor Detail

AtTimeMerit

public AtTimeMerit(Map<String,String> prop)

Constructs a at-time merit starting at the current time and with a default risetime (DEFRISE) and sharpness (DEFSHARP . Proper creation should be done using the AbstractMerit.createMerit(java.util.Map<java.lang.String, java.lang.String>) method. This create method also takes care of proper parameter overloading.

Method Detail

getMerit

public double getMerit(GlobalGrouping set,
                       Appointable target,
                       Collection<Appointable> ignore,
                       long spms)

Calculates the actual time slot merit. We return the maximum of the merit from now until the specified time span.

Parameters:

set - Current observing conditions.

target - The actual target.

ignore - All targets, observable or not.

spms - The relevant time span in ms.