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

[Konrad Hinsen]

> Can anyone explain to me whether the following is a feature or a bug?
> 
> Python 1.4 (Oct 31 1996)  [GCC 2.7.2]
> Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
> >>> import ni,Numeric
> >>> def g(a):
> ...     return a
> ... 
> >>> x = Numeric.fromfunction(g,[10])
> >>> x
> 0 1 2 3 4 5 6 7 8 9
> >>> len(x)
> 10
> >>>
> >>>
> >>> def g(a):
> ...     return 5
> ... 
> >>> x = Numeric.fromfunction(g,[10])
> >>> x
> 5

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).

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Konrad Hinsen                          | E-Mail: hinsen@ibs.ibs.fr
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