[PYTHON MATRIX-SIG] Odd behavior of "Numeric.fromfunction"

[David Ascher]

> Feature, though not a well-known one. fromfunction() works correctly
> only if the function
> 1) uses all its arguments
> 2) consists only of scalar operations defined on arrays (i.e. elementary
>    arithmetic operations and functions from umath).

This is in the tutorial:

---
Currently, the function which is called by fromfunction can only use
numerical operations and ufuncs on its arguments. It cannot, for
example, use if ... else: ...  constructs. This is due to the fact that
fromfunction does operations "en masse" to speed up evaluation. If you
need to fill an array with the result of a function which does not meet
these criteria, you can always use a function like:
---

I will also add in the next release of the tutorial code from Konrad
which removes these limitations (at the expense of speed, alas).

--david


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