The language R starts up with some messages including this:
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
On Tue, Jan 21, 2014 at 2:11 PM, Joe Bogner <joebog...@gmail.com> wrote:
> Another solution is to enhance the experience of jconsole. I get a
> blank screen that is ready for input when I start it up.
>
> if the repl had a bit of introductory language and a built-in help
> system to show the z_locale for example
>
> Something like:
>
> jconsole - version x - type help'' for help
>
> > help''
>
> The base locale is z. Enter names_z_ 3 to get a list of standard verbs
> (functions) or names_z_ '' to see all standard names. Enter the name
> to see the definition. Verbs are either monadic (one parameter) or
> dyadic (two parameters). A monadic verb takes the argument on the
> right. A dyadic verb takes the argument on the left and right.
> Example: exit''
>
>
> Of course even "names_z_ 3" may seem odd to an absolute newbie.
>
> It's all very powerful, just not very obvious. Perhaps the repl can
> have special handling for help or ? or something so a person doesn't
> need to deal with the blank parameter.
>
> Compared to some other REPLs.
>
> Kona - does a really nice job and seems to take the approach of having
> nearly all the documentation inside the repl (little is available
> online). I don't need to leave the environment to get help.
>
> joebo@joebo:~/dev/kona$ ./k
> K Console - Enter \ for help
>
> > \
>
> Backslash Commands:
> \0 datatypes help
> \+ verb help
> \' adverb help
> \: I/O verb help
> \_ reserved word help
> \. assignment/amend, function, control flow help
> \d [todo] directory command (todo)
> \l f load script f or f.k
> \p [n] show/set print precision (0=full)
> \r [s] show/set random seed
> \s f step script f or f.k
> \t [e] measure runtime of some k expression
> \w show workspace resources used
> \[cmd] system command (also \[ cmd]), \echo hello
> \\ exit (or ctrl+d)
>
> > \0
>
> Datatypes -4 -3 -2 -1 0 1 2 3 4 5 6 7
> Monadic 4: reveals type, 4:1 2 3 yields -1
> -4 vector symbol `a`b`c or ,`a
> -3 vector character "abc" or ,"c"
> -2 vector float 1.0 2.0 3.33 or ,1.0
> -1 vector integer 1 2 3 or ,1
> 0 list general (`a;1 2 3) or (`a;(1 2 3;(3 4;"c")))
> 1 scalar integer 1
> 2 scalar float 1.0
> 3 scalar character "c"
> 4 scalar symbol `s
> 5 dictionary .((`a;10;);(`b;20;)) or .() or .,(`a;5;)
> 6 nil _n or (;;) (list of 3 nils)
> 7 verbs/functions + +: {1+x} +[1;] (|+) {[a;b]1+a+b} {x+y}[1;]
> Empty Lists:
> -4 0#`
> -3 ""
> -2 0#0.0
> -1 !0
> 0 ()
> Special numeric types:
> 0N null integer
> 0n null float
> -0I infinity integer negative
> 0I infinity integer positive
> -0i infinity float negative
> 0i infinity float positive
> Dictionaries:
> Start by making a dictionary d[`k]:4
>
>
> > \+
>
> Dyadic or monadic is determined from context, default is dyadic
> Add : after a verb to force the monadic form, + is plus, +: is flip
> + monadic flip. transpose a matrix (a depth-2 list)
> + dyadic plus. add numbers together
> - monadic negate. invert sign
> - dyadic minus. subtraction
> * monadic first. first element from the list
> * dyadic times. multiply two numbers
> % monadic reciprocal. 1 over x
>
>
> Or ipython
>
> C:\Python27>python Scripts\ipython
> Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit (Intel)]
> Type "copyright", "credits" or "license" for more information.
>
> IPython 1.0.0 -- An enhanced Interactive Python.
> ? -> Introduction and overview of IPython's features.
> %quickref -> Quick reference.
> help -> Python's own help system.
> object? -> Details about 'object', use 'object??' for extra details.
>
>
> In [4]: dir()
> Out[4]:
> ['In',
> 'Out',
> '_',
> '__',
> '___',
> '__builtin__',
> '__builtins__',
> '__doc__',
> '__name__',
> '_dh',
> '_i',
> '_i1',
> '_i2',
> '_i3',
> '_i4',
> '_ih',
> '_ii',
> '_iii',
> '_oh',
> '_sh',
> 'exit',
> 'get_ipython',
> 'help',
> 'quit']
>
>
> Haskell:
>
> GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help
> Loading package ghc-prim ... linking ... done.
> Loading package integer-gmp ... linking ... done.
> Loading package base ... linking ... done.
> Prelude> :?
> Commands available from the prompt:
>
> <statement> evaluate/run <statement>
> : repeat last command
> :{\n ..lines.. \n:}\n multiline command
> :add [*]<module> ... add module(s) to the current target set
> :browse[!] [[*]<mod>] display the names defined by module <mod>
>
>
> On Tue, Jan 21, 2014 at 12:22 PM, Murray Eisenberg
> <mur...@math.umass.edu> wrote:
> > And just how is one supposed to discover the existence of “exit"?
> >
> > There’s a broader issue here: on the one hand, the disjointedness of the
> standard J documentation into General Info, Release Highlights, Vocabulary,
> User, Primer, etc.; and on the other hand, the lack of a search across the
> local documentation. (At least so far as I can find.)
> >
> > Find in Files is of no use for “exit”, since as I recall most or all
> stuff in the z locale is now coded at a low level rather than in a J script.
> >
> > An on-line search at www.jsoftware.com and even in jwiki doesn’t seem
> to reveal the existence of “exit”, either.
> >
> > Of course even if there were such a productive search available, it
> wouldn’t help if you didn’t know that “exit” is what you should search for.
> >
> > So I’ll second Blake McBride’s suggestion of a “comprehensive dictionary
> of pre-defined verbs”.
> >
> >
> > At Mon, 20 Jan 2014 12:06:30 -0700, Don Guinn <dongu...@gmail.com>
> wrote:
> >
> >> exit is already defined in the z locale.
> >>
> >>
> >> On Mon, Jan 20, 2014 at 11:31 AM, Devon McCormick <devon...@gmail.com
> >wrote:
> >>
> >>> This is a good point and it's been brought up before. I define
> >>> q=: 2!:55
> >>> and enter
> >>> q''
> >>> to exit J but it's not standard. We should probably make "exit" more
> >>> accessible.
> >>>
> >>>
> >>> On Mon, Jan 20, 2014 at 1:23 PM, Blake McBride <bl...@mcbride.name>
> wrote:
> >>>
> >>>> Greetings,
> >>>>
> >>>> Just providing some feedback....
> >>>>
> >>>> The fist thing I wanted to know when I started J was how to exit. I
> did
> >>>> some research and discovered 2!:55. I then defined a verb and used
> that
> >>> to
> >>>> exit. Therefore, in order to get a clean way to exit a new language,
> I
> >>> had
> >>>> to learn what a verb is, what system verbs were available, how to
> define
> >>>> it, and how to load it. (I know about ^d but think that is hardly a
> >>> clean
> >>>> way to exit.)
> >>>>
> >>>> Now, years later, I discover the pre-defined verb 'exit'. I checked
> the
> >>>> docs, especially "Learning J". There is no mention of 'exit'!
> >>>>
> >>>> As someone who has played with many languages over the years, and in
> fact
> >>>> an author of one, I respectfully suggest updating chapter 1 of
> Learning J
> >>>> to tell the user how to exit. Making a research project out of the
> first
> >>>> obvious desire is an unnecessary impediment to a language acquision.
> >>>>
> >>>> Additionally, since I discovered 'exit', a comprehensive dictionary of
> >>>> pre-defined verbs would be very helpful. (I know about z, etc.)
> >>>>
> >>>> Thanks. Just some thoughts...
> >
> > ——
> > Murray Eisenberg mur...@math.umass.edu
> > Mathematics & Statistics Dept.
> > Lederle Graduate Research Tower phone 240 246-7240 (H)
> > University of Massachusetts
> > 710 North Pleasant Street
> > Amherst, MA 01003-9305
> >
> >
> >
> >
> >
> >
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
--
Devon McCormick, CFA
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
