anchor.diff:  [[inform_effective_info]]
   [source,c]
   ----
  +double inform_effective_info(double const *tpm, double const *inter,
  +        size_t n, inform_error *err);
   ----
   ****
   
  
positive.code: [[inform_local_conditional_entropy]]
  [source,c]
  ----
  ----
  ****
  
  
negative.code: [[inform_local_transfer_entropy]]
  [source,c]
  ----
  double *inform_local_transfer_entropy(int const *src, int const *dst,
          int const *back, size_t l, size_t n, size_t m, int b, size_t k,
          double *te, inform_error *err);
  ----
  ****
  