anchor.diff:  [[inform_pid]]
   [source,c]
   ----
  +inform_pid_lattice *inform_pid(int const *stimulus,
  +        int const *responses, size_t l, size_t n, int bs,
  +        int const *br, inform_error *err);
   ----
   ****
   
  
positive.code: [[inform_transfer_entropy]]
  [source,c]
  ----
  ----
  ****
  
  
negative.code: [[inform_relative_entropy]]
  [source,c]
  ----
  double inform_relative_entropy(int const *xs, int const *ys, size_t n,
          int b, inform_error *err);
  ----
  ****
  
  