> On 14 March 2011 16:40, Julien PUYDT <julien.pu...@laposte.net> wrote: > > Le 14/03/2011 14:12, David Kirkby a écrit : > > > > The solution of finding a "good" integer is fragile : it will break > > anytime wind will change direction. > > I tend to agree. > > > Actually, the best solution is the one I gave : handle fuzzy results! You > > have to keep in mind that floats can't seriously be used for equality -- > > there is a margin of error (and the margin moves according to the > > floating comma which gave its name to the type). > > > > Are doctests pure string checks? Can't they allow things like "(result - > > expected) < 0.0000001" ? > > The "doc" in the doctest indicates a test of the documentation. The > Sage documentation has numerous examples. The doctests check that > those examples produce the same strings as the documentation > indicates, which is what you see here. > > The usual approach in Sage for these "numerical noise" issues as > people here call them, is to test only a certain number of the digits. > > So whilst you can make a test like you say, It would not test the > documentation in the same way as is intended in this test. > > There probably is a better solution than what I know, but I've only > ever seen these issues resolved this way. > Actually rather than putting ellipses we could ask for the result with a given number of significant with say .n(5) or something. That would take care of problems like 119.9999 and so on.
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