I didn't mean to change stdlib sooner or later, but if we do it again, rank 0 should be a better option.
Why users (beginner or not) would write a+"0 b or sin"0 ? On Sun, Jan 17, 2021, 8:20 AM Henry Rich <[email protected]> wrote: > I would be happy for a user to do that, but changing stdlib might not be > a good idea. Beginning users often write > > a +"0 b > > and it doesn't cost them dearly. If you make the change, sin"0 will be > expensive. > > Henry Rich > > On 1/16/2021 7:17 PM, bill lam wrote: > > Thanks. then defining sine as 1&o."0 should be fine. > > > > On Sun, Jan 17, 2021, 8:07 AM Henry Rich <[email protected]> wrote: > > > >> What makes them efficient is IRS. 1&o. supports IRS; 1&o."0 does not. > >> Is you define sin as 1&o."0, sin will run fast, but sin"0 will not. > >> > >> Henry Rich > >> > >> On 1/16/2021 6:24 PM, bill lam wrote: > >>> IIUC All atomic math functions are rank 0 but support IRS so that they > >> are > >>> as efficient as rank infinity on long array arguments. > >>> > >>> The question should be that > >>> is 1&o."0 as efficient as 1&o. on long arrays. > >>> > >>> On Sun, Jan 17, 2021, 12:32 AM Henry Rich <[email protected]> > wrote: > >>> > >>>> Terminology. If verb v has IRS, it can handle v"n internally without > a > >>>> rank loop. > >>>> > >>>> + has IRS. +"n does not need a rank loop. > >>>> > >>>> +"n does not have IRS. +"n"n2 does need a rank loop. > >>>> > >>>> +/@:*"1 has IRS, but +/@:* does not - that's how they're coded. > >>>> > >>>> 1&o."0 does not have IRS. > >>>> > >>>> Henry Rich > >>>> > >>>> On 1/16/2021 11:27 AM, bill lam wrote: > >>>>> but the verb in this question is > >>>>> (1&o.)"0 > >>>>> > >>>>> even if 1&o. has IRS, does (1&o.)"0 also has IRS ? > >>>>> > >>>>> > >>>>> On Sun, Jan 17, 2021, 12:02 AM Henry Rich <[email protected]> > >> wrote: > >>>>>> m&v does have IRS if v does. I didn't know that until I just > checked. > >>>>>> > >>>>>> Henry Rich > >>>>>> > >>>>>> On 1/16/2021 7:10 AM, bill lam wrote: > >>>>>>> I'm not sure if 1&o."0 has IRS (integrated rank support) or not. If > >> it > >>>>>>> doesn't then I think the phase with infinity rank is fine. > >>>>>>> > >>>>>>> > >>>>>>> On Sat, Jan 16, 2021, 7:02 PM Arnab Chakraborty < > [email protected]> > >>>>>> wrote: > >>>>>>>> Dear all, > >>>>>>>> > >>>>>>>> Just wondering if the correct defn of sin shouldn't be > >>>>>>>> > >>>>>>>> sin=:1&o."0 > >>>>>>>> > >>>>>>>> instead of > >>>>>>>> > >>>>>>>> sin=:1&o. > >>>>>>>> which has rank infinity. > >>>>>>>> > >>>>>>>> With the rank infinity definition +/@sin behaves just like +/@:sin > >>>>>>>> > >>>>>>>> But, ideally, +/@sin 4 5 should be a list of two numbers, while > >>>> +/@:sin > >>>>>>>> should be their sum. > >>>>>>>> > >>>>>>>> Just like, +/@*: and +/@:*: > >>>>>>>> > >>>>>>>> > >>>>>>>> Thanks and regards, > >>>>>>>> > >>>>>>>> Arnab > >>>>>>>> > >> ---------------------------------------------------------------------- > >>>>>>>> For information about J forums see > >>>> http://www.jsoftware.com/forums.htm > >> ---------------------------------------------------------------------- > >>>>>>> For information about J forums see > >> http://www.jsoftware.com/forums.htm > >>>>>> -- > >>>>>> This email has been checked for viruses by AVG. > >>>>>> https://www.avg.com > >>>>>> > >>>>>> > ---------------------------------------------------------------------- > >>>>>> For information about J forums see > >> http://www.jsoftware.com/forums.htm > >>>>> > ---------------------------------------------------------------------- > >>>>> For information about J forums see > http://www.jsoftware.com/forums.htm > >>>> -- > >>>> This email has been checked for viruses by AVG. > >>>> https://www.avg.com > >>>> > >>>> ---------------------------------------------------------------------- > >>>> For information about J forums see > http://www.jsoftware.com/forums.htm > >>>> > >>> ---------------------------------------------------------------------- > >>> For information about J forums see http://www.jsoftware.com/forums.htm > >> > >> -- > >> This email has been checked for viruses by AVG. > >> https://www.avg.com > >> > >> ---------------------------------------------------------------------- > >> For information about J forums see http://www.jsoftware.com/forums.htm > >> > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
