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 > <javascript:>> 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 <javascript:>>: >> > >> > 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 <javascript:>. >> > For more options, visit https://groups.google.com/d/optout. >> >> >> >> -- >> Vasiliy Tolstov, >> e-mail: v.to...@selfip.ru <javascript:> >> >> -- >> 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 <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > -- > > *Michael T. jonesmichae...@gmail.com <javascript:>* > -- 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.
