Eric> APL faced this problem twenty-five years ago. I like its Eric> solution; a `fuzz' variable defining the Eric> close-enough-for-equality range. I used to like APL's approach, but I've changed my mind. Part of the reason is that there are some places where unfuzzed comparison is essential, such as sorting. Another part is that fuzzy comparison destroys substitutability: If a==b, it is not always true that f(a)==f(b). Much as I like APL, I'd rather use Scheme's numeric model. -- Andrew Koenig, ark@research.att.com, http://www.research.att.com/info/ark
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