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delta.h

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template <class T>
class delta_trans
{
public:
  void forward( T *vec, size_t len )
  {
    if (vec != 0 && len > 0) {
      // reference value
      T next;
      T refVal = vec[0];

      for (size_t i = 1; i < len; i++) {
        next = vec[i];
        vec[i] = vec[i] - refVal;
        refVal = next;
      }
    }
  } // forward

  void inverse( T *vec, size_t len )
  {
    if (vec != 0 && len > 0) {
      for (size_t i = 1; i < len; i++) {
        vec[i] = vec[i] + vec[i-1];
      }
    }
  } // inverse

}; // delta_trans

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