NominalAttribute (Spark 2.2.3 JavaDoc)

Object
- org.apache.spark.ml.attribute.Attribute
- - org.apache.spark.ml.attribute.NominalAttribute

All Implemented Interfaces:

java.io.Serializable
```
public class NominalAttribute
extends Attribute
```
A nominal attribute. param: name optional name param: index optional index param: isOrdinal whether this attribute is ordinal (optional) param: numValues optional number of values. At most one of numValues and values can be defined. param: values optional values. At most one of numValues and values can be defined.

See Also:

Serialized Form

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`AttributeType`	`attrType()` Attribute type.
`static NominalAttribute`	`defaultAttr()` The default nominal attribute.
`boolean`	`equals(Object other)`
`scala.Option<Object>`	`getNumValues()` Get the number of values, either from `numValues` or from `values`.
`String`	`getValue(int index)` Gets a value given its index.
`int`	`hashCode()`
`boolean`	`hasValue(String value)` Tests whether this attribute contains a specific value.
`scala.Option<Object>`	`index()` Index of the attribute.
`int`	`indexOf(String value)` Index of a specific value.
`boolean`	`isNominal()` Tests whether this attribute is nominal, true for `NominalAttribute` and `BinaryAttribute`.
`boolean`	`isNumeric()` Tests whether this attribute is numeric, true for `NumericAttribute` and `BinaryAttribute`.
`scala.Option<Object>`	`isOrdinal()`
`scala.Option<String>`	`name()` Name of the attribute.
`scala.Option<Object>`	`numValues()`
`static Metadata`	`toMetadata()`
`static Metadata`	`toMetadata(Metadata existingMetadata)`
`static String`	`toString()`
`static StructField`	`toStructField()`
`static StructField`	`toStructField(Metadata existingMetadata)`
`scala.Option<String[]>`	`values()`
`NominalAttribute`	`withIndex(int index)` Copy with a new index.
`NominalAttribute`	`withName(String name)` Copy with a new name.
`NominalAttribute`	`withNumValues(int numValues)` Copy with a new `numValues` and empty `values`.
`NominalAttribute`	`withoutIndex()` Copy without the index.
`NominalAttribute`	`withoutName()` Copy without the name.
`NominalAttribute`	`withoutNumValues()` Copy without the `numValues`.
`NominalAttribute`	`withoutValues()` Copy without the values.
`NominalAttribute`	`withValues(String[] values)` Copy with new values and empty `numValues`.
`NominalAttribute`	`withValues(String first, scala.collection.Seq<String> others)` Copy with new values and empty `numValues`.
`NominalAttribute`	`withValues(String first, String... others)` Copy with new values and empty `numValues`.

Methods inherited from class org.apache.spark.ml.attribute.Attribute
toMetadata, toMetadata, toString, toStructField, toStructField

Methods inherited from class Object
getClass, notify, notifyAll, wait, wait, wait

- Method Detail
  - defaultAttr
```
public static final NominalAttribute defaultAttr()
```
    The default nominal attribute.
  - toMetadata
```
public static Metadata toMetadata(Metadata existingMetadata)
```
  - toMetadata
```
public static Metadata toMetadata()
```
  - toStructField
```
public static StructField toStructField(Metadata existingMetadata)
```
  - toStructField
```
public static StructField toStructField()
```
  - toString
```
public static String toString()
```
  - withValues
```
public NominalAttribute withValues(String first,
                                   String... others)
```
    Copy with new values and empty numValues.
    
    Parameters:
    
    first - (undocumented)
    
    others - (undocumented)
    
    Returns:
    
    (undocumented)
  - name
```
public scala.Option<String> name()
```
    Description copied from class: Attribute
    
    Name of the attribute. None if it is not set.
    
    Specified by:
    
    name in class Attribute
  - index
```
public scala.Option<Object> index()
```
    Description copied from class: Attribute
    
    Index of the attribute. None if it is not set.
    
    Specified by:
    
    index in class Attribute
  - isOrdinal
```
public scala.Option<Object> isOrdinal()
```
  - numValues
```
public scala.Option<Object> numValues()
```
  - values
```
public scala.Option<String[]> values()
```
  - attrType
```
public AttributeType attrType()
```
    Description copied from class: Attribute
    
    Attribute type.
    
    Specified by:
    
    attrType in class Attribute
  - isNumeric
```
public boolean isNumeric()
```
    Description copied from class: Attribute
    
    Tests whether this attribute is numeric, true for NumericAttribute and BinaryAttribute.
    
    Specified by:
    
    isNumeric in class Attribute
    
    Returns:
    
    (undocumented)
  - isNominal
```
public boolean isNominal()
```
    Description copied from class: Attribute
    
    Tests whether this attribute is nominal, true for NominalAttribute and BinaryAttribute.
    
    Specified by:
    
    isNominal in class Attribute
    
    Returns:
    
    (undocumented)
  - indexOf
```
public int indexOf(String value)
```
    Index of a specific value.
  - hasValue
```
public boolean hasValue(String value)
```
    Tests whether this attribute contains a specific value.
  - getValue
```
public String getValue(int index)
```
    Gets a value given its index.
  - withName
```
public NominalAttribute withName(String name)
```
    Description copied from class: Attribute
    
    Copy with a new name.
    
    Specified by:
    
    withName in class Attribute
  - withoutName
```
public NominalAttribute withoutName()
```
    Description copied from class: Attribute
    
    Copy without the name.
    
    Specified by:
    
    withoutName in class Attribute
  - withIndex
```
public NominalAttribute withIndex(int index)
```
    Description copied from class: Attribute
    
    Copy with a new index.
    
    Specified by:
    
    withIndex in class Attribute
  - withoutIndex
```
public NominalAttribute withoutIndex()
```
    Description copied from class: Attribute
    
    Copy without the index.
    
    Specified by:
    
    withoutIndex in class Attribute
  - withValues
```
public NominalAttribute withValues(String[] values)
```
    Copy with new values and empty numValues.
    
    Parameters:
    
    values - (undocumented)
    
    Returns:
    
    (undocumented)
  - withValues
```
public NominalAttribute withValues(String first,
                                   scala.collection.Seq<String> others)
```
    Copy with new values and empty numValues.
    
    Parameters:
    
    first - (undocumented)
    
    others - (undocumented)
    
    Returns:
    
    (undocumented)
  - withoutValues
```
public NominalAttribute withoutValues()
```
    Copy without the values.
  - withNumValues
```
public NominalAttribute withNumValues(int numValues)
```
    Copy with a new numValues and empty values.
    
    Parameters:
    
    numValues - (undocumented)
    
    Returns:
    
    (undocumented)
  - withoutNumValues
```
public NominalAttribute withoutNumValues()
```
    Copy without the numValues.
    
    Returns:
    
    (undocumented)
  - getNumValues
```
public scala.Option<Object> getNumValues()
```
    Get the number of values, either from numValues or from values. Return None if unknown.
    
    Returns:
    
    (undocumented)
  - equals
```
public boolean equals(Object other)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object

Class NominalAttribute

Method Summary

Methods inherited from class org.apache.spark.ml.attribute.Attribute

Methods inherited from class Object

Method Detail

defaultAttr

toMetadata

toMetadata

toStructField

toStructField

toString

withValues

name

index

isOrdinal

numValues

values

attrType

isNumeric

isNominal

indexOf

hasValue

getValue

withName

withoutName

withIndex

withoutIndex

withValues

withValues

withoutValues

withNumValues

withoutNumValues

getNumValues

equals

hashCode