An APL interpreter written in APL

@inproceedings{Penfield1975AnAI,
  title={An APL interpreter written in APL},
  author={Paul Penfield},
  booktitle={APL '75},
  year={1975}
}
An APL interpreter has been written in APL. It includes a set of interacting APL functions that accept quote-quad input and act on it in the same way as APL itself would. The interpreter will be used to test some proposed APL language extensions. Extensions already implemented on it include complex number arithmetic, and reduction and scan operators acting on defined as well as primitive scalar functions.