Guilty. ;-) It's also more complicated because of the desire for saturating arithmetic.
On Thu, Oct 25, 2018 at 9:57 AM Scott Cotton <w...@iri-labs.com> wrote: > > > On Wednesday, 24 October 2018 18:52:27 UTC+2, Michael Jones wrote: >> >> https://en.wikipedia.org/wiki/Q_(number_format) says it all. >> >> you can use fixed point all the way...just shift after multiplies and >> before divides and use double-width (int32) or wider math. >> >> > Yes, that's close enough for many purposes. But it gets more complicated > with carries/rounding and other functions (such as trig). > > Scott > > > >> On Mon, Oct 22, 2018 at 3:24 PM Vasiliy Tolstov <v.to...@selfip.ru> >> wrote: >> >>> Thanks for suggestions. >>> If somebody can look at github.com/unistack-org/go-crush package >>> (ported ceph crush to go) i'l be happy. >>> Now weight represented as float32, i'm try to use >>> https://github.com/shopspring/decimal but code looks ugly with many >>> conversations. And also as i see ceph code (mapper.c for crush) they >>> does not use something >>> different for weights but uint32. may be i miss something but i don't >>> understand how they deal with weights like 0.580 in such cases. >>> So if somebody wants to help - i'l be happy. >>> пн, 22 окт. 2018 г. в 17:14, 'Ingo Oeser' via golang-nuts >>> <golan...@googlegroups.com>: >>> > >>> > https://godoc.org/golang.org/x/image/math/fixed might provide some >>> hints how to work with this kind of type. >>> > >>> > The idea is to use a special type and provide all operations you need. >>> > >>> > https://godoc.org/math/big#Rat might be helpful to create first tests >>> of the basic math operations with maximum precision, before reducing >>> precision with a conversion to a more limited data type. >>> > >>> > -- >>> > You received this message because you are subscribed to the Google >>> Groups "golang-nuts" group. >>> > To unsubscribe from this group and stop receiving emails from it, send >>> an email to golang-nuts...@googlegroups.com. >>> > For more options, visit https://groups.google.com/d/optout. >>> >>> >>> >>> -- >>> Vasiliy Tolstov, >>> e-mail: v.to...@selfip.ru >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "golang-nuts" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to golang-nuts...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> -- >> >> *Michael T. jonesmichae...@gmail.com* >> > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- *Michael T. jonesmichael.jo...@gmail.com <michael.jo...@gmail.com>* -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
