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## weka.core.pmml
Class Expression

    java.lang.Object
      weka.core.pmml.Expression

All Implemented Interfaces:
  java.io.Serializable

Direct Known Subclasses:
  Constant, Discretize, FieldRef, NormContinuous, NormDiscrete

    public abstract class Expression

extends java.lang.Object
implements java.io.Serializable

See Also:
  Serialized Form

Constructor Summary
`Expression(FieldMetaInfo.Optype opType, java.util.ArrayList<Attribute> fieldDefs)`

Method Summary
`static Expression` | `getExpression(org.w3c.dom.Node container, FieldMetaInfo.Optype opType, java.util.ArrayList<Attribute> fieldDefs, weka.core.pmml.TransformationDictionary transDict)` Static factory method that returns a subclass of Expression that encapsulates the type of expression contained in the Element supplied.
`static Expression` | `getExpression(java.lang.String name, org.w3c.dom.Node expression, FieldMetaInfo.Optype opType, java.util.ArrayList<Attribute> fieldDefs, weka.core.pmml.TransformationDictionary transDict)` Static factory method that returns a subclass of Expression that encapsulates the type of expression supplied as an argument.
`Attribute` | `getFieldDef(java.lang.String attName)` Return the named attribute from the list of reference fields.
`int` | `getFieldDefIndex(java.lang.String attName)`
`FieldMetaInfo.Optype` | `getOptype()` Get the optype of the result of applying this Expression.
`abstract double` | `getResult(double[] incoming)` Get the result of evaluating the expression.
`abstract java.lang.String` | `getResultCategorical(double[] incoming)` Gets the result of evaluating the expression when the optype is categorical or ordinal as the actual String value.
`double` | `getResultContinuous(double[] incoming)` Get the result of evaluating the expression for continuous optype.
`void` | `setFieldDefs(java.util.ArrayList<Attribute> fieldDefs)` Set the field definitions for this Expression to use
`java.lang.String` | `toString()`
`java.lang.String` | `toString(java.lang.String pad)`

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

Constructor Detail

### Expression

    public Expression(FieldMetaInfo.Optype opType,
                      java.util.ArrayList<Attribute> fieldDefs)

Method Detail

### setFieldDefs

    public void setFieldDefs(java.util.ArrayList<Attribute> fieldDefs)
                      throws java.lang.Exception

  Set the field definitions for this Expression to use

  Parameters:
    `fieldDefs` - the field definitions to use
  Throws:
    `java.lang.Exception` - if there is a problem setting the field definitions

### getResult

    public abstract double getResult(double[] incoming)
                              throws java.lang.Exception

  Get the result of evaluating the expression. In the case of a continuous optype, a real number is returned; in the case of a categorical/ordinal optype, the index of the nominal value is returned as a double.

  Parameters:
    `incoming` - the incoming parameter values
  Returns:
    the result of evaluating the expression
  Throws:
    `java.lang.Exception` - if there is a problem computing the result

### getResultContinuous

    public double getResultContinuous(double[] incoming)
                               throws java.lang.Exception

  Get the result of evaluating the expression for continuous optype. Is the same as calling getResult() when the optype is continuous.

  Parameters:
    `incoming` - the incoming parameter values mining schema
  Returns:
    the result of evaluating the expression.
  Throws:
    `java.lang.Exception` - if the optype is not continuous.

### getResultCategorical

    public abstract java.lang.String getResultCategorical(double[] incoming)
                                                   throws java.lang.Exception

  Gets the result of evaluating the expression when the optype is categorical or ordinal as the actual String value.

  Parameters:
    `incoming` - the incoming parameter values
  Returns:
    the result of evaluating the expression
  Throws:
    `java.lang.Exception` - if the optype is continuous

### getExpression

    public static Expression getExpression(org.w3c.dom.Node container,
                                           FieldMetaInfo.Optype opType,
                                           java.util.ArrayList<Attribute> fieldDefs,
                                           weka.core.pmml.TransformationDictionary transDict)
                                    throws java.lang.Exception

  Static factory method that returns a subclass of Expression that encapsulates the type of expression contained in the Element supplied. Assumes that there is just one expression contained in the supplied Element.

  Parameters:
    `container` - the Node containing the expression
    `opType` - the optype of the value returned by this Expression.
    `fieldDefs` - an ArrayList of Attributes for the fields that this Expression may need to access Since Expressions are children of either DerivedFields or DefineFuntions, they will have the same optype as their parent.
    `transDict` - the TransformationDictionary (may be null if there is no dictionary)
  Returns:
    an Expression object or null if there is no known expression in the container
  Throws:
    `java.lang.Exception` - for unsupported Expression types

### getExpression

    public static Expression getExpression(java.lang.String name,
                                           org.w3c.dom.Node expression,
                                           FieldMetaInfo.Optype opType,
                                           java.util.ArrayList<Attribute> fieldDefs,
                                           weka.core.pmml.TransformationDictionary transDict)
                                    throws java.lang.Exception

  Static factory method that returns a subclass of Expression that encapsulates the type of expression supplied as an argument.

  Parameters:
    `name` - the name of the Expression to get
    `expression` - the Node containing the expression
    `opType` - the optype of the value returned by this Expression.
    `fieldDefs` - an ArrayList of Attributes for the fields that this Expression may need to access Since Expressions are children of either DerivedFields or DefineFuntions, they will have the same optype as their parent.
    `transDict` - the TransformationDictionary (may be null if there is no dictionary)
  Returns:
    an Expression object or null if there is no known expression in the container
  Throws:
    `java.lang.Exception` - for unsupported Expression types

### getFieldDef

    public Attribute getFieldDef(java.lang.String attName)

  Return the named attribute from the list of reference fields.

  Parameters:
    `attName` - the name of the attribute to retrieve
  Returns:
    the named attribute (or null if it can't be found).

### getFieldDefIndex

    public int getFieldDefIndex(java.lang.String attName)

### getOptype

    public FieldMetaInfo.Optype getOptype()

  Get the optype of the result of applying this Expression.

  Returns:
    the optype of the result of applying this Expression

### toString

    public java.lang.String toString()

  Overrides:
    `toString` in class `java.lang.Object`

### toString

    public java.lang.String toString(java.lang.String pad)

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