Re: Developing Octave-Forge packages

[Sergei Steshenko]

And, FWIW:

"
octave:2>  x = sym("x");
octave:3> differentiate(x * x,x)
error: T& Array<T>::checkelem (2, -1, -1): range error
error: binary operator `*' not implemented for `ex' by `ex' operations
error: evaluating binary operator `*' near line 3, column 17
error: evaluating argument list element number 1
".

Regards,
  Sergei.