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## de.jstacs.scoringFunctions.mix
Class StrandScoringFunction

    java.lang.Object
      de.jstacs.scoringFunctions.AbstractNormalizableScoringFunction
          de.jstacs.scoringFunctions.mix.AbstractMixtureScoringFunction
              de.jstacs.scoringFunctions.mix.StrandScoringFunction

All Implemented Interfaces:
  Mutable, NormalizableScoringFunction, ScoringFunction, Storable, Cloneable

    public class StrandScoringFunction

extends AbstractMixtureScoringFunction
implements Mutable

This class enables the user to search on both strand. So the motif can be found on the forward or on the reverse complementary strand.

Author:
  Jens Keilwagen
See Also:
  `ComplementableDiscreteAlphabet`, `AlphabetContainer.isReverseComplementable()`

Nested Class Summary
`static class` | `StrandScoringFunction.InitMethod` This enum defines the different types of plug-in initialization of a `StrandScoringFunction`.

Field Summary

Fields inherited from class de.jstacs.scoringFunctions.mix.AbstractMixtureScoringFunction
`componentScore, dList, freeParams, function, hiddenParameter, hiddenPotential, iList, logGammaSum, logHiddenNorm, logHiddenPotential, norm, optimizeHidden, paramRef, partNorm`

Fields inherited from class de.jstacs.scoringFunctions.AbstractNormalizableScoringFunction
`alphabets, length, r`

Fields inherited from interface de.jstacs.scoringFunctions.ScoringFunction
`UNKNOWN`

Constructor Summary
`StrandScoringFunction(NormalizableScoringFunction function, double forwardPartOfESS, int starts, boolean plugIn, StrandScoringFunction.InitMethod initMethod)` This constructor creates a StrandScoringFunction that optimizes the usage of each strand.
`StrandScoringFunction(NormalizableScoringFunction function, int starts, boolean plugIn, StrandScoringFunction.InitMethod initMethod, double forward)` This constructor creates a StrandScoringFunction that has a fixed frequency for the strand usage.
`StrandScoringFunction(StringBuffer xml)` This is the constructor for `Storable`.

Method Summary
`protected void` | `extractFurtherInformation(StringBuffer xml)` This method is the opposite of `AbstractMixtureScoringFunction.getFurtherInformation()`.
`protected void` | `fillComponentScores(Sequence seq, int start)` Fills the internal array `AbstractMixtureScoringFunction.componentScore` with the logarithmic scores of the components given a `Sequence`.
`double` | `getEss()` Returns the equivalent sample size (ess) of this model, i.e. the equivalent sample size for the class or component that is represented by this model.
`protected StringBuffer` | `getFurtherInformation()` This method is used to append further information of the instance to the XML representation.
`double` | `getHyperparameterForHiddenParameter(int index)` This method returns the hyperparameter for the hidden parameter with index `index`.
`String` | `getInstanceName()` Returns a short instance name.
`protected double` | `getLogNormalizationConstantForComponent(int i)` Computes the logarithm of the normalization constant for the component `i`.
`double` | `getLogPartialNormalizationConstant(int parameterIndex)` Returns the logarithm of the partial normalization constant for the parameter with index `parameterIndex`.
`double` | `getLogScoreAndPartialDerivation(Sequence seq, int start, IntList indices, DoubleList partialDer)` Returns the logarithmic score for a `Sequence` beginning at position `start` in the `Sequence` and fills lists with the indices and the partial derivations.
`static double[][][]` | `getReverseComplementDistributions(ComplementableDiscreteAlphabet abc, double[][][] condDistr)` This method computes the reverse complement distributions for given conditional distributions.
`StrandedLocatedSequenceAnnotationWithLength.Strand` | `getStrand(Sequence seq, int startPos)` This method returns the preferred `StrandedLocatedSequenceAnnotationWithLength.Strand` for a given subsequence.
`protected void` | `init(boolean freeParams)` This method creates the underlying structure for the parameters.
`protected void` | `initializeUsingPlugIn(int index, boolean freeParams, Sample[] data, double[][] weights)` This method initializes the functions using the data in some way.
`boolean` | `modify(int offsetLeft, int offsetRight)` Manually modifies the model.
`protected void` | `setForwardProb(double forward)` This method can be used to set the forward strand probability.
`String` | `toString()`

Methods inherited from class de.jstacs.scoringFunctions.mix.AbstractMixtureScoringFunction
`addGradientOfLogPriorTerm, clone, cloneFunctions, computeHiddenParameter, computeLogGammaSum, determineIsNormalized, fromXML, getCurrentParameterValues, getFunction, getFunctions, getIndexOfMaximalComponentFor, getIndices, getLogNormalizationConstant, getLogPriorTerm, getLogScore, getMaxIndex, getNumberOfComponents, getNumberOfParameters, getNumberOfRecommendedStarts, getProbsForComponent, getScoringFunctions, getSizeOfEventSpaceForRandomVariablesOfParameter, getXMLTag, initializeFunction, initializeFunctionRandomly, initializeHiddenPotentialRandomly, initializeHiddenUniformly, initWithLength, isInitialized, isNormalized, precomputeNorm, setHiddenParameters, setParameters, setParametersForFunction, toXML`

Methods inherited from class de.jstacs.scoringFunctions.AbstractNormalizableScoringFunction
`getAlphabetContainer, getInitialClassParam, getLength, getLogScore, getLogScoreAndPartialDerivation, getNumberOfStarts, isNormalized`

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### StrandScoringFunction

    public StrandScoringFunction(NormalizableScoringFunction function,
                                 double forwardPartOfESS,
                                 int starts,
                                 boolean plugIn,
                                 StrandScoringFunction.InitMethod initMethod)
                          throws CloneNotSupportedException,
                                 WrongAlphabetException

  This constructor creates a StrandScoringFunction that optimizes the usage of each strand.

  Parameters:
    `function` - the ScoringFunction
    `forwardPartOfESS` - the part of the full ESS that should be used as hyperparameter for the forward strand
    `starts` - the number of starts the should be done in an optimization
    `plugIn` - whether the initial parameters for an optimization should be related to the data or randomly drawn
    `initMethod` - only used if `plugIn==true`
    whether the initial parameters for an optimization should be related to the data of the forward strand, the backward strand or both strands
  Throws:
    `CloneNotSupportedException` - if `function` could not be cloned
    `WrongAlphabetException` - if the alphabet of `function` is not `AlphabetContainer.isReverseComplementable()` and, hence, cannot be used for a strand mixture
  See Also:
    `StrandScoringFunction.InitMethod`

### StrandScoringFunction

    public StrandScoringFunction(NormalizableScoringFunction function,
                                 int starts,
                                 boolean plugIn,
                                 StrandScoringFunction.InitMethod initMethod,
                                 double forward)
                          throws CloneNotSupportedException,
                                 WrongAlphabetException

  This constructor creates a StrandScoringFunction that has a fixed frequency for the strand usage.

  Parameters:
    `function` - the ScoringFunction
    `starts` - the number of starts the should be done in an optimization
    `plugIn` - whether the initial parameters for an optimization should be related to the data or randomly drawn
    `initMethod` - only used if `plugIn==true`
    whether the initial parameters for an optimization should be related to the data of the forward strand, the backward strand or both strands
    `forward` - the probability of a motif to be on the forward strand
  Throws:
    `CloneNotSupportedException` - if `function` could not be cloned
    `WrongAlphabetException` - if the alphabet of `function` is not `AlphabetContainer.isReverseComplementable()` and, hence, cannot be used for a strand mixture
  See Also:
    `StrandScoringFunction.InitMethod`

### StrandScoringFunction

    public StrandScoringFunction(StringBuffer xml)
                          throws NonParsableException

  This is the constructor for `Storable`.

  Parameters:
    `xml` - the xml representation
  Throws:
    `NonParsableException` - if the representation could not be parsed.

Method Detail

### setForwardProb

    protected void setForwardProb(double forward)

  This method can be used to set the forward strand probability.

  Parameters:
    `forward` - the forward strand probability in (0,1)

### getLogNormalizationConstantForComponent

    protected double getLogNormalizationConstantForComponent(int i)

  Description copied from class: `AbstractMixtureScoringFunction`
  Computes the logarithm of the normalization constant for the component `i`.

  Specified by:
    `getLogNormalizationConstantForComponent` in class `AbstractMixtureScoringFunction`
  Parameters:
    `i` - the index of the component
  Returns:
    the logarithm of the normalization constant of the component

### getLogPartialNormalizationConstant

    public double getLogPartialNormalizationConstant(int parameterIndex)
                                              throws Exception

  Description copied from interface: `NormalizableScoringFunction`
  Returns the logarithm of the partial normalization constant for the parameter with index `parameterIndex`. This is the logarithm of the partial derivation of the normalization constant for the parameter with index `parameterIndex`,
  .

  Specified by:
    `getLogPartialNormalizationConstant` in interface `NormalizableScoringFunction`
  Parameters:
    `parameterIndex` - the index of the parameter
  Returns:
    the logarithm of the partial normalization constant
  Throws:
    `Exception` - if something went wrong with the normalization
  See Also:
    `NormalizableScoringFunction.getLogNormalizationConstant()`

### getHyperparameterForHiddenParameter

    public double getHyperparameterForHiddenParameter(int index)

  Description copied from class: `AbstractMixtureScoringFunction`
  This method returns the hyperparameter for the hidden parameter with index `index`.

  Specified by:
    `getHyperparameterForHiddenParameter` in class `AbstractMixtureScoringFunction`
  Parameters:
    `index` - the index of the hidden parameter
  Returns:
    the hyperparameter for the hidden parameter

### getEss

    public double getEss()

  Description copied from interface: `NormalizableScoringFunction`
  Returns the equivalent sample size (ess) of this model, i.e. the equivalent sample size for the class or component that is represented by this model.

  Specified by:
    `getEss` in interface `NormalizableScoringFunction`
  Returns:
    the equivalent sample size.

### initializeUsingPlugIn

    protected void initializeUsingPlugIn(int index,
                                         boolean freeParams,
                                         Sample[] data,
                                         double[][] weights)
                                  throws Exception

  Description copied from class: `AbstractMixtureScoringFunction`
  This method initializes the functions using the data in some way.

  Specified by:
    `initializeUsingPlugIn` in class `AbstractMixtureScoringFunction`
  Parameters:
    `index` - the class index
    `freeParams` - if `true`, the (reduced) parameterization is used``
    `data` - the data
    `weights` - the weights for the data
  Throws:
    `Exception` - if the initialization could not be done
  See Also:
    `ScoringFunction.initializeFunction(int, boolean, Sample[], double[][])`

### getInstanceName

    public String getInstanceName()

  Description copied from interface: `ScoringFunction`
  Returns a short instance name.

  Specified by:
    `getInstanceName` in interface `ScoringFunction`
  Returns:
    a short instance name

### fillComponentScores

    protected void fillComponentScores(Sequence seq,
                                       int start)

  Description copied from class: `AbstractMixtureScoringFunction`
  Fills the internal array `AbstractMixtureScoringFunction.componentScore` with the logarithmic scores of the components given a `Sequence`.

  Specified by:
    `fillComponentScores` in class `AbstractMixtureScoringFunction`
  Parameters:
    `seq` - the sequence
    `start` - the start position in `seq`

### getLogScoreAndPartialDerivation

    public double getLogScoreAndPartialDerivation(Sequence seq,
                                                  int start,
                                                  IntList indices,
                                                  DoubleList partialDer)

  Description copied from interface: `ScoringFunction`
  Returns the logarithmic score for a `Sequence` beginning at position `start` in the `Sequence` and fills lists with the indices and the partial derivations.

  Specified by:
    `getLogScoreAndPartialDerivation` in interface `ScoringFunction`
  Parameters:
    `seq` - the `Sequence`
    `start` - the start position in the `Sequence`
    `indices` - an `IntList` of indices, after method invocation the list should contain the indices i where is not zero
    `partialDer` - a `DoubleList` of partial derivations, after method invocation the list should contain the corresponding that are not zero
  Returns:
    the logarithmic score for the `Sequence`

### getFurtherInformation

    protected StringBuffer getFurtherInformation()

  Description copied from class: `AbstractMixtureScoringFunction`
  This method is used to append further information of the instance to the XML representation. This method is designed to allow subclasses to add information to the XML representation.

  Overrides:
    `getFurtherInformation` in class `AbstractMixtureScoringFunction`
  Returns:
    the further information as XML code in a `StringBuffer`
  See Also:
    `AbstractMixtureScoringFunction.extractFurtherInformation(StringBuffer)`

### extractFurtherInformation

    protected void extractFurtherInformation(StringBuffer xml)
                                      throws NonParsableException

  Description copied from class: `AbstractMixtureScoringFunction`
  This method is the opposite of `AbstractMixtureScoringFunction.getFurtherInformation()`. It extracts further information of the instance from a XML representation.

  Overrides:
    `extractFurtherInformation` in class `AbstractMixtureScoringFunction`
  Parameters:
    `xml` - the `StringBuffer` containing the information to be extracted as XML code
  Throws:
    `NonParsableException` - if the `StringBuffer` could not be parsed
  See Also:
    `AbstractMixtureScoringFunction.getFurtherInformation()`

### init

    protected void init(boolean freeParams)

  Description copied from class: `AbstractMixtureScoringFunction`
  This method creates the underlying structure for the parameters.

  Overrides:
    `init` in class `AbstractMixtureScoringFunction`
  Parameters:
    `freeParams` - indicates whether to use only free parameters or all parameters

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### modify

    public boolean modify(int offsetLeft,
                          int offsetRight)

  Description copied from interface: `Mutable`
  Manually modifies the model. The two offsets `offsetLeft` and `offsetRight` define how many positions the left or right border positions shall be moved. Negative numbers indicate moves to the left while positive numbers correspond to moves to the right.

  Specified by:
    `modify` in interface `Mutable`
  Parameters:
    `offsetLeft` - the offset on the left side
    `offsetRight` - the offset on the right side
  Returns:
    `true` if the motif model was modified otherwise `false`

### getReverseComplementDistributions

    public static double[][][] getReverseComplementDistributions(ComplementableDiscreteAlphabet abc,
                                                                 double[][][] condDistr)

  This method computes the reverse complement distributions for given conditional distributions. This method is used to determine the context of a motif.

  Parameters:
    `abc` - the alphabet
    `condDistr` - the conditional distribution
  Returns:
    the complement of the conditional distribution that can be used for computing a combing conditional distribution

### getStrand

    public StrandedLocatedSequenceAnnotationWithLength.Strand getStrand(Sequence seq,
                                                                        int startPos)

  This method returns the preferred `StrandedLocatedSequenceAnnotationWithLength.Strand` for a given subsequence.

  Parameters:
    `seq` - the sequence
    `startPos` - the start position
  Returns:
    the `StrandedLocatedSequenceAnnotationWithLength.Strand` of this subsequence
  See Also:
    `AbstractMixtureScoringFunction.getIndexOfMaximalComponentFor(Sequence, int)`

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