features2vector: convert various input as features to a vector
Usage
features2vector(features)
Arguments
features
the input features, one of: 
- character vector,
whose elements will be split on whitespace; 
- list of characters,
consisting of a list of token patterns, separated by white space; 
- tokens object; 
- dictionary object; 
- collocations object. 
 Value
an unnamed vector of features