Re: [Numpy-discussion] ufuncs on user-defined types in numarray
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First, thanks Todd for elevating this to 'requested feature' status. Konrad, I had no idea what interval arithmetic is, so I looked it up. I'm not sure if what I've done is considered interval arithmetic - I suspect it is, but that I've only implemented it partially. The code isn't that clever. It doesn't care about propagating rounding errors correctly at the error limits. It just implements a brute-force approach to calculating operations on the error limits of a data-point value along with the central value. This is already more accurate than what most people do, which is to linearise the error limits and treat them as infinitessimals. The central and outer values are grouped in an object and any operations are applied, without any consideration of rounding errors, to all three values for every operation. Gary ----- Original Message -----
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Gary Ruben