2?.8 2 4 Uninflected ? might need a footnote (or should maybe be elided -- that's possibly not the sort of information a person would value from the reference card).
I imagine that the reference card's primary value for me would be reminding me of operations which I had forgotten and a way of quickly identifying details which distinguish similar operations. It's not going to be a tutorial... -- Raul On Tue, Aug 9, 2022 at 6:57 PM Elijah Stone <elro...@elronnd.net> wrote: > > Yes, but it obscures the point that the result is random, so one is left > looking for patterns. > > On Tue, 9 Aug 2022, Henry Rich wrote: > > > Giving the actual value is a way of making the point that the stream is > > the same for all invocations, unlike for 2 ? 8. > > > > Henry Rich > > > > On 8/9/2022 6:54 PM, Elijah Stone wrote: > >> That 2 ?. 8 is 2 4 is an accident. It doesn't explain why or how ?. > >> works. For instance, ([ , %~) is another verb that gives 2 4 from 2 f > >> 8; I'm sure imagination can supply others. The random number is not > >> guaranteed to generate any result in particular across versions; only, > >> within a given version, it is stable. What is important about ?. is > >> that it generates random numbers, and that the stream is the same for > >> all invocations. > >> > >> On Tue, 9 Aug 2022, Henry Rich wrote: > >> > >>> Thanks to you, Hauke, Don for the comments. > >>> > >>> The Glossary has links to definitions. > >>> > >>> We made the decision that !&| would be better known that the standard > >>> math symbols > >>> > >>> Certain special combinations ARE shown; which ones would you like? > >>> > >>> 2 ?. 8 is 2 4. What's wrong with that? > >>> > >>> The Re and Im are a standard math notation. > >>> > >>> The formulas is for the Moore-Penrose inverse, which is what %. y > >>> computes > >>> > >>> If you want a simpler card, make one! > >>> > >>> Henry Rich > >>> > >>> > >>> > >>> > >>> > >>> On 8/9/2022 5:28 PM, Elijah Stone wrote: > >>>> It claims that x|y is x mod y, but it is in fact y mod x. > >>>> > >>>> I don't think an example result of 2 4 for ?. is helpful. > >>>> > >>>> In 'scalar dyadic verbs', why is footnote b attached to 'rnd', but > >>>> footnote c is attached to '?.'? They should be consistent. > >>>> > >>>> I think that instead of 'Rank of ?. _, others 0', it should be 'Rank > >>>> 0 (except ?.)'. Begin with the common case, then list exceptions. > >>>> > >>>> The way the words 'Shape, Length, Rank' are spaced makes it look > >>>> like they are labels for the columns of the table they accompany. I > >>>> don't know what the solution is; it might be a good idea to > >>>> left-align the table headings, or possibly tighten the horizontal > >>>> spacing. > >>>> > >>>> The vertical spacing, on the other hand, is too tight; it makes the > >>>> tables difficult to scan. I would loosen it, even if it requires > >>>> adding a third page. > >>>> > >>>> Names of standard library functions (datatype, load, etc.) don't > >>>> link anywhere. > >>>> > >>>> 'r. π' should presumably be 'r. 1p1', as it is meant to be a j > >>>> sentence? > >>>> > >>>> Maybe it helps somebody, but I find the colouration on the second > >>>> page--in particular for modifier trains and conjunctions--too busy; > >>>> I would mute it a bit. But this is a matter of taste. > >>>> > >>>> For @., rather than '[x] Vn y' with a footnote to explain what n is, > >>>> I would say '[x] Vn y [ n=. [x] v y'. I would also use subscripts > >>>> for 0, 1, and n. And I would replace n with i, since n is > >>>> conventionally used to name an argument to a conjunction. > >>>> > >>>> u::v needs a space after u. I suggest that it should be stylised 'u > >>>> . v', not 'u .v' (and analogously for other conjunctions that start > >>>> with inflections). > >>>> > >>>> '[x] u^:v y' is '[x] u^:([x] v y) y', which is not what the > >>>> reference says. Perhaps there should be a second row giving the > >>>> common case of v as a predicate. > >>>> > >>>> In 'apply [x&]u til x&u y false', the second 'x&' needs to be > >>>> bracketed as optional. > >>>> > >>>> In place of '[x&]u ...(n times) y', I would say '[x] u [x] u ...(n > >>>> times) y'. I don't think the & is helpful, and and showing multiple > >>>> instances of u makes it clearer exactly what it is that is happening > >>>> n times. > >>>> > >>>> In the 'sort and grade' section, for a moment, I thought 'abcd' was > >>>> intended as a left argument to all the verbs. I guess this is > >>>> because it is the middle-most item. Maybe simply reordering would > >>>> fix it. Perhaps move /:@/: up above the sorts, together with the > >>>> grades. Then 'abcd' is no longer in the middle, and /:~ has pride > >>>> of place as the last row (since it is likely to be the most common > >>>> use of /: et co). > >>>> > >>>> In 'atomic compound forms a?b', it looks like there is an > >>>> application of the verb ?. I would at the least italicise it rather > >>>> than bolding it. > >>>> > >>>> I am curious where the convention of using black capital letters R > >>>> and I to indicate the real and imaginary parts of a complex number > >>>> comes from. > >>>> > >>>> On Tue, 9 Aug 2022, Henry Rich wrote: > >>>> > >>>>> Viktor Grigorov has a draft version of the new J Reference Card. > >>>>> Please criticize it. > >>>>> > >>>>> The source for the card is a LaTeX document, and will be freely > >>>>> available for editing. > >>>>> > >>>>> A PDF version is at > >>> > > https://drive.google.com/file/d/1bpyfmksD-XEJaJJ972jOy3b2_KWfV0Wi/view?usp=sharing > >>> > >>>>> > >>>>> Henry Rich > >>>>> > >>>>> -- > >>>>> 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 > >>> > >>> ---------------------------------------------------------------------- > >>> For information about J forums see http://www.jsoftware.com/forums.htm > >>> > >> ---------------------------------------------------------------------- > >> For information about J forums see http://www.jsoftware.com/forums.htm > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
