On Dec 6, 4:54 pm, Carl Banks <pavlovevide...@gmail.com> wrote: > On Dec 6, 11:34 am, Anton81 <gerenu...@googlemail.com> wrote: > > > I do some linear algebra and whenever the prefactor of a vector turns > > out to be zero, I want to remove it. > > > I'd like to keep the system comfortable. So basically I should write a > > new class for numbers that has it's own __eq__ operator? > > Is there an existing module for that? > > I highly recommend against it; among other things it invalidates the > transitive property of equality: > > "If a == b and b == c, then a == c." > > It will also make the number non-hashable, and have several other > negative consequences. What numbers are close enought to be condidered > "equal" > depends on the calculations. > > (I remember once struggling in a homework assignment over seemingly > large discrepancies in a calculation I was doing, until i realized > that the actual numbers were on the scale of 10**11, and the > difference was around 10**1, so it really didn't matter.) > > Carl Banks
Maybe it's the gin, but "Plus, it's not something that's never foolproof.' +1 QOTW Cheers, TheSeeker -- http://mail.python.org/mailman/listinfo/python-list
