As long as one hasn’t understood what 'fill' is
and anticipates it happening, I recommend to
rather use ; than , ,. ,: when comparing results
of (supposedly) related verbs.
One might guess that + +. and +: could be just as similar
and try (+ , +. ,: +:) 4 5 6 the result of which would
not be very helpful when trying to learn about those verbs.
(+ ; +. ; +:) 4 5 6 at least explains +:
One set of functions where I found this particularly helpful
was the {. family. I needed to do this:
({. ; }. ; {: ; }:) i.5
many times until I memorized which change was caused by
the flip from { to } and which one by the different inflection.
Hauke
Am 06.09.21 um 00:12 schrieb 'Michael Day' via Programming:
Hello Joseph,
Unfortunately, >. is not defined as (greater than or equal to)
It's very important to realise that
> >. and >: are three different, albeit related, primitives.
and even more important that (nearly?) all symbols or letters
used for J primitives can be monographs, or digraphs with a
trailing . or :
Some have other modifications; there are even some trigraphs.
That's why the vocabularies have 3 columns.
(And many/most verbs can be monadic or dyadic. eg, * can be
sign (monad) as well as multiply (dyad))
Here,
> is (greater than)
3 4 5 > 2 4 6 NB. for example, is 3 > 2, is 4 > 4, and is 5 > 6 ?
1 0 0
>. is (maximum) NB. what are max(3,2), max(4,4), max(5,6) ?
3 4 5 >. 2 4 6
3 4 6
>: is (greater than or equal to)
3 4 5 > 2 4 6 NB. for example, is 3 >= 2, is 4 >= 4, and is 5 >=
6 ?
1 1 0
Perhaps it's instructive, or possibly confusing to examine all three
dyads at once:
3 4 5 (>, >. ,: >:) 2 4 6 NB. three rows, one for each verb!
1 0 0
3 4 6
1 1 0
Any help?
Mike
On 05/09/2021 22:21, joseph turco wrote:
Hey Raul,
I was speaking in context to the book 'arithmetic' not in general. In the
exercises for the first chapter for example, it says to use two user
defined verbs that the book has you define earlier in the chapter, but
the
problem is, is that you never do that ( i used the search function, not
just scrolling up and down, there is no sign of these verbs). Another
problem was that the following was a exercise and was asked by the
book to
write these out before computing it. i liked that idea. but the following
never explained:
d =: 0 1 2 3 4
d >. d</d
0 1 1 1 1
1 1 1 1 1
2 2 2 2 2
3 3 3 3 3
4 4 4 4 4
d <. d</d
0 0 0 0 0
0 0 1 1 1
0 0 0 1 1
0 0 0 0 1
0 0 0 0 0
if >. is greater or equal to, why is 2's being printed across the chart?
why with <., are true and false values being printed than the nouns in
the
vector like the >. shows?
maybe the book really isn't for the level of novice i am, or the book
just
isn't laid out correctly. As i said
i am reading the J primer and that has been much better so far. If i
misread something in the 'arithmetic' book
id like to be proven wrong. In regards to study time, ive been using most
of my spare time learning to program as i
find it fascinating, and it also doesn't cost me a dime (well, other than
the hydro).
regards,
Joseph Turco
The book
On Sun, Sep 5, 2021 at 4:36 PM Raul Miller <rauldmil...@gmail.com> wrote:
You might also want to try some of the J labs.
Also... my experience was that I needed to circle back and re-read
things after learning parts of the language. While I suppose it's
technically true that "all you need to know is how to count", that's
true in the sense that calculus is just another method for counting.
You still need to be able to work through the examples and understand
what you are seeing...
But be sure to pace yourself. A half hour a day is better than 4 hours
once a week.
Thanks,
--
Raul
On Sun, Sep 5, 2021 at 1:41 PM joseph turco <italian.pepe...@gmail.com>
wrote:
Hello R.E.Boss
I Do not have any post-secondary education, and am solely programming
just
out of recreation is the best way i can put it. Ive only dabbled in
other
programming languages and didn't find them interesting. I actually
Found
J
after having issues getting Dyalog APL running on my 64-bit ARM
computer,
and J worked perfectly. I also appreciate the fact it uses ASCII
characters
and not a special character set. I am an italian-canadian, and only
know
the language from being raised around it, so its what i know other than
english, that's not saying i hate it. I actually dumped the arithmetic
book
as it doesn't make much sense of explaining things (the book says
all you
need to know is how to count) and its missing things that are
referred in
some sections. Im giving the J Primer a crack too see if helps me.
regards,
Joseph Turco
On Sun, Sep 5, 2021 at 11:51 AM R.E. Boss <r.e.b...@outlook.com> wrote:
Can you tell us a bit about your background? Did you program before?
Which
languages? Why was Italian not a language to learn for fun?
Welcome anyhow!
One can have worse reasons to learn a language.
R. E. Boss
-----Original Message-----
From: Programming <programming-boun...@forums.jsoftware.com> On
Behalf Of
joseph turco
Sent: zaterdag 4 september 2021 17:01
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] Hello, new programmer here!
Thanks Bo,
I am actually following the 'Learning J' book that is on the J
website.
its been good so far, but i've been getting a bit confused with the
'&'
verb and '@:' verb and what makes them different (they are verbs
right?).
Its funny because i was bored of math class in high school and was one
of
those kids who "skipped" a lot, but using a language like J has
made me
fascinated with what is possible.
regards,
Joseph Turco
On Sat, Sep 4, 2021 at 7:06 AM 'Bo Jacoby' via Programming <
programm...@jsoftware.com> wrote:
Welcome Joseph!
Being an old programmer I became fascinated by J.
There is a lot to learn, but some of it is unnecessary to the
beginner.
The 3 operations, addition (+), multiplication (*), and
exponentiation
(^), are sufficient for many computations. Having sign change (-) you
do not need subtraction (b-a)=(b+-a), and division
(b%a)=(*/(b,a)^1,-1), nor (%a)=(a^-1), (%:a)=(a^2^-1), (+:a)=(a*2),
(-:a)=(a*2^-1), (-.a)=(1+-a), (>:a)=(1+a), (*:a)=(a^2).
Note that expressions are evaluated from right to left:
(a^b^c)=(a^(b^c)) Have fun!
Bo.
Den fredag den 3. september 2021 20.24.11 CEST skrev joseph
turco
<
italian.pepe...@gmail.com>:
Hello all,
I am a novice programmer and was looking for a language to learn for
fun. I tried APL but I couldn't get the keybindings to work on my
computer. I then found J from reddit and some google fu. It looks
like
an awesome language, and i can't wait to learn more and make some fun
programs. I'd thought i'd pop in and say hello, so hi!
regards,
Joseph TUrco
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