index2: Index
In news-r/word2vec.r: Implementation of 'Julia' 'Word2vec'

Return the index of the work in the vectors.

index(model, word)

## S3 method for class 'wordvectors'
index(model, word)

## S3 method for class 'wordclusters'
index(model, word)

`model`	A model as returned by `word_vectors` or `word_clusters`.
`word`	The word to extract.

## Not run: 
# setup word2vec Julia dependency
setup_word2vec()

# sample corpus
data("macbeth", package = "word2vec.r")

# train model
model_path <- word2vec(macbeth)

# get word vectors
model <- word_vectors(model_path)

# cindex of macbeth
index(model, "macbeth")

## End(Not run)