Mark Dickinson wrote: > On Sep 24, 2:53 pm, Steven D'Aprano <steve > +comp.lang.pyt...@pearwood.info> wrote: >> I'm trying to generate a sequence of equally-spaced numbers between a >> lower and upper limit. Given arbitrary limits, what is the best way to >> generate a list of equally spaced floats with the least rounding error >> for each point? >> >> For example, suppose I want to divide the range 0 to 2.1 into 7 equal >> intervals, then the end-points of each interval are: >> >> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1) >> >> and I'd like to return the values in the brackets. Using Decimal or >> Fraction is not an option, I must use floats. If the exact value isn't >> representable as a float, I'm okay with returning the nearest possible >> float. > > Can you explain why you're constrained not to use Fraction? Speed?
Speed is important, but secondary to correctness. To be honest, I never even thought of using fractions as an intermediate result -- I was thinking of generating lists of Fractions. I think I can use this approach. But out of curiosity, how would you do it using nothing but floats? Is there a way? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
