code: public T elementLog()
      {
          T c = createLike();
          ops.elementLog(mat,c.mat);
          return c;
      }
docs: <p>
  Returns a matrix which is the result of an element by element exp of 'this'
  c<sub>i,j</sub> = Math.log(a<sub>i,j</sub>)
  </p>
  
  @return The element by element power of 'this' and 'b'.