[Matrix-SIG] Ternary power of arrays

[Travis E. Oliphant]

Having recently had some experience with the ufunc object while building
the cephes module I think I know why the power function was called as a
binary function:  All ufuncs currently must take only one or two
arguments.  I don't know of any way in the current code to make a ufunc
object out of a function which takes more than two arguments.  

For the completion of the cephes module I also need functions that will
take up to 5 or 6 arbitrary arguments.   I don't really need the methods
that come with the ufunc objects (reduce, accumulate, etc.) just the
ability to take arbitrary arrays and expand dimensions cleanly.  So, can
we make a more generic ufunc?  Or do we hack it to take 3, 4, or maybe 5
arguments? 

A definite item to think about for any would-be developers.


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Travis Oliphant            200 First St SW          
    	                   Rochester MN 55905       
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Mayo Graduate School	   Oliphant.Travis@mayo.edu