[Numpy-discussion] New ufuncs
Charles R Harris
Tue Nov 4 23:26:38 CST 2008
I'm thinking of adding some new ufuncs. Some possibilities are
- expadd(a,b) = exp(a) + exp(b) -- For numbers stored as logs:
- absdiff(a,b) = abs(a - b) -- Useful for forming norms
- absmax(a,b) = max(abs(a), abs(b))
- absadd(a,b) = abs(a) + abs(b) -- Useful for L_1 norm and inequalities?
I would really like a powadd = abs(a)**p + abs(b)**p, but I can't think of
an easy way to pass a variable p that is compatible with the way ufuncs work
without going to three variables, something that might not work with the
reduce functions. Along these lines I also think it is time to review
generalized ufuncs to see what we can do with them. Thoughts?
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