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## cc.mallet.pipe
Class Array2FeatureVector

    java.lang.Object
      cc.mallet.pipe.Pipe
          cc.mallet.pipe.Array2FeatureVector

All Implemented Interfaces:
  AlphabetCarrying, java.io.Serializable

    public class Array2FeatureVector

extends Pipe

Converts a Java array of numerical types to a FeatureVector, where the Alphabet is the data array index wrapped in an Integer object.

Author:
  Jerod Weinman weinman@cs.umass.edu
See Also:
  Serialized Form

Constructor Summary
`Array2FeatureVector()`
`Array2FeatureVector(Alphabet dataAlphabet, Alphabet targetAlphabet)` Construct a pipe based on the dimensions of the data and target.
`Array2FeatureVector(int capacity)`

Method Summary
`Instance` | `pipe(Instance carrier)` Convert the data in an `Instance` from an array to a `FeatureVector` leaving other fields unchanged.
`int` | `size()` Current size of the Vocabulary

Methods inherited from class cc.mallet.pipe.Pipe
`alphabetsMatch, getAlphabet, getAlphabets, getDataAlphabet, getInstanceId, getTargetAlphabet, instanceFrom, instancesFrom, instancesFrom, isDataAlphabetSet, isTargetProcessing, newIteratorFrom, preceedingPipeDataAlphabetNotification, preceedingPipeTargetAlphabetNotification, precondition, readResolve, setDataAlphabet, setOrCheckDataAlphabet, setOrCheckTargetAlphabet, setTargetAlphabet, setTargetProcessing`

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

Constructor Detail

### Array2FeatureVector

    public Array2FeatureVector(int capacity)

### Array2FeatureVector

    public Array2FeatureVector()

### Array2FeatureVector

    public Array2FeatureVector(Alphabet dataAlphabet,
                               Alphabet targetAlphabet)

  Construct a pipe based on the dimensions of the data and target.

Method Detail

### pipe

    public Instance pipe(Instance carrier)
                  throws java.lang.IllegalStateException

  Convert the data in an `Instance` from an array to a `FeatureVector` leaving other fields unchanged. `Instance.getData()` must return a numeric array, and it is cast to `double[]`

  Overrides:
    `pipe` in class `Pipe`
  Throws:
    `java.lang.IllegalStateException` - If `Instance.getTarget()` is not a Labeling

### size

    public int size()

  Current size of the Vocabulary

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