function x = emailFeatures(word_indices)
  ##EMAILFEATURES takes in a word_indices vector and produces a feature vector
  ##from the word indices
  ##   x = EMAILFEATURES(word_indices) takes in a word_indices vector and 
  ##   produces a feature vector from the word indices. 

  ## Total number of words in the dictionary
  n = 1899;

  ## You need to return the following variables correctly.
  x = zeros(n, 1);
  
  x(word_indices) = 1;

endfunction