[PYTHON MATRIX-SIG] Applying a general function to an array

[David Redish]

>An example of the sort of function you want to do this with would be
>very helpful in answering this.  Many python functions already work as
>you describe.

This is fine for already-coded python functions (like exp), but what I
really want to know how to add new C-coded functions.

For example, I have a gaussian function coded up in C that takes care
of normalization, random-sampling with a gaussian distribution, etc.
So I'd like to be able to apply that function to each element of an
array.  I could recode the function in python, but that would be much
slower.  Also, it's already nicely coded-up as a C-coded python object
and software-reuse is the word here, right?

e.g. I can currently do:

	x = 10
	G = Gaussian(wt, mean, variance)
	y = G(x)

	A = arange(10)
	G = Gaussian(wt, mean, variance)
	Y = G(A)

where G is a C-coded python object that defines a __call__ function.

thanx
adr

PS. I am using these for NN's similar to RBFs. (:

------------------------------------------------------------
David Redish		Computer Science Department CMU
graduate student	Neural Processes in Cognition Training Program
			Center for the Neural Basis of Cognition (CNBC)
http://www.cs.cmu.edu/Web/People/dredish/home.html
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