This is probably the wrong forum for this conversation, so I'll just
recommend you spend a few minutes over at http://dyalog.com/
Thanks,
--
Raul
On Thu, Jul 31, 2014 at 1:53 AM, Jon Hough wrote:
> Although I no zero APL, I understand that J was born from APL with an
> ASCII character set a
Although I no zero APL, I understand that J was born from APL with an ASCII
character set and some ideas from Backus' languages.
And I am aware many J programmers are also APL programmers.
So do modern APL dialects provide any functionality not included in J?
For example, or counterexample, I do
With CRC32 you can only ever have 2^32 different values, which is not
different enough when x has more than 2^32 items.
Reducing the chance of collision is the main point of hashing.
On Wed, Jul 30, 2014 at 9:30 PM, bill lam wrote:
> Sorry Roger. I forgot pointer arithmatic.
>
> BTW I think h
Sorry Roger. I forgot pointer arithmatic.
BTW I think hardware crc32 can also be used in J64. What will
be its downside apart from higer chance of getting collison when
compared to crc64?
Ср, 30 июл 2014, Roger Hui написал(а):
> Actually, no. z would be declared to be a pointer of the appropri
eval =: 1 : ' a: 1 : m'
u2m =: 1 : (':';'x m eval y')
v2n =: 2 : (':';'x (u v eval) y')
v2nS =: 2 : (':';'x (v eval u) y')
u2m is limited to monadic result verbs, but because you can build the
parameters, you can also create bound verbs:
'+' (] (' eval' u2m)~ '3&' ,[) 2
5
the parameter
Actually, no. z would be declared to be a pointer of the appropriate type
and z=z+1; would make z point to the next item.
z=z+sizeof(*z); would in fact be wrong. For example, if z points to a
4-byte integer, sizeof(*z) would be 4 and z=z+sizeof(*z); would make z
point to 4 items further. You ca
Sorry for being meticulous, the last step probably better be expressed as
z=z+sizeof(*z)
On Jul 31, 2014 12:37 AM, "Roger Hui" wrote:
> Thanks for your comments and questions.
>
> 0. The C code presented is only for a primitive datatype (in C). The paper
> (script) says this. The basic hashing
Thanks for all your help both with the original problem and with the debugger.
I may still use the GUI debugger in J602 for a while (when I need a debugger)
as I find it convenient; otherwise I am happy with 8.02.
As for removing all of R before installing a new version, I meant before
install
Like others, I'm learning to use j effectively on tiny smart phone
display. I had considered preprocessing source with m4 to produce long
j sentences. Considering m4 helped me finally understand eval. Eval
directly converts literals into j code. Now I have another option to
compose j.
Thank
Thanks for your comments and questions.
0. The C code presented is only for a primitive datatype (in C). The paper
(script) says this. The basic hashing logic still works for other
datatypes, but instead of using == and != (the C equals and not-equal)
you'd need something more elaborate. Still
Roger,
Because my C is so weak I could use some explanation in words of what the C
is doing, not in general, but to discuss the questions below.
Would you say that the basic approach that is being taken in DO's is more
like the APL\360 definition or more like the Extended definition. I guess I
am
at2 should be arctan from ratio of 2 numbers so that the domain
of at2 is an array with the last dimension being 2, ie, $y = ... 2
or at2=: (12&o.)@(j./)
or at2=: (12&o.)@(j./)"1
at2 working on a longer list of number is not its original
intention.
J is sometimes difficult to read because its co
Ok, https://en.wikipedia.org/wiki/Atan2 makes sense.
In this case, though, it probably makes sense to constrain the last
dimension so that it only contains two values.
Perhaps?
atan2=: 3 :'{:"1 *. j./"1 y assert. 2={:$y'
Not that code can ever be perfect, or anything...
Thanks,
--
Raul
I think you are referring to http://rosettacode.org/wiki/Multiline_shebang#J
Thanks,
--
Raul
On Tue, Jul 29, 2014 at 11:58 PM, bill lam wrote:
> IIRC about 2 decades ago, the file extension for j scripts was "js" but
> later java became popular and they used the same file extension. J had t
At2 is a function Cliff Reiter developed. The at is arctan. I'm not sure
what the 2 means.
Your version at3 simply incorporates the i: of this example. However y
in his version allows different domains:
at2=: 13 :'([:{:"1 *.) j./"1 y'
at2 4
0
at2 i.4
_2.35619
at
I guess there is no need to change "-" if symlink is also used.
Ср, 30 июл 2014, Björn Helgason написал(а):
> Could change the - to /
>
> ~$ ln -s /home/chris/j64/802/bin/jconsole jc
>
> I guess the 32 bit will be around for quite some time.
>
> Or /J802/64/bin
>
> __---_
> htt
Could change the - to /
~$ ln -s /home/chris/j64/802/bin/jconsole jc
I guess the 32 bit will be around for quite some time.
Or /J802/64/bin
__---_
https://groups.google.com/forum/m/#!forum/havaogskulamal
On 30 Jul 2014 00:47, "chris burke" wrote:
> It should work as described,
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