Graham,
My experience is very similar to yours: J is excellent for solving engineering
problems on time, but then comes a request to repackage the tool into something
that non-J users can use more easily (Python if you are lucky, Excel if you are
not so fortunate, Shell if you are allowed to
Why not teach J in the math classes in the schools. Prepare all students for
the skills they might need in science, technology,engineering, sand
mathematics. STEM is the big push here in Florida.
I would recommend MSET. Then they have used J in math, science and engineering
classes and get to
What is the advantage of defining Ca and p when the first statement has
no added parentheses?
2.5 (>. % [: <. + * -) 4
_0.4
2.5 (>. % Ca <.p + * -) 4
_0.4
2.5 (>. % [ <.@] + * -) 4
_0.4
Linda
Original Message-n
From: programming-boun...@forums.jsoftware.com
[mailto:programm
When I was first using plot I saved this little script so I would remember
how to get dots. Mayboe it will help you.
pd 'reset'
pd 'itemcolor red'
pd 'type marker'
pd 'markersize 1.4'
pd 'markers circle'
NB.pd (i.15);15?30
pd (0{"1 p);1{"1 p
pd 'itemcolor blue'
NB.pd (5
Graham and Philip.
When an engineering problem is solved on time comes a request to destroy the
solution. Don't do it. Refuse! It is bad economy. Do some explaining and
commenting, and make simplifications and improvements on the code, but don't
translate it into an inferior language. Two versio
A chapter from my fantasy world. Kindergarten First Semester $
Imagine C, D, E... as little symbols like a cat, a dog, an elephant...
]C=:42 { a.
*
]D=:35 { a.
#
4 $ C
12 $ D
2 4 $ C
**
2 4 $ C
3 4 2 $ D
##
##
##
##
##
##
##
##
##
##
##
##
Of course a real python solution involving an existing implementation
should be a few lines of python that call into the existing
implementation...
Anyways, if I were in your situation, I would explain that I expected
that my python development costs would be about 5x my J development
costs, and t
Sounds dishonest to me.
Sent from my iPhone
On 7 Dec 2012, at 12:29, Raul Miller wrote:
> Of course a real python solution involving an existing implementation
> should be a few lines of python that call into the existing
> implementation...
>
> Anyways, if I were in your situation, I would e
Why dishonest?
Granted, I approximated, but there are a variety of costs here having
to do with making sure the result is reliable and works properly.
Mind you, with that kind of price, I might lose the customer, but
think about it, this price has to include things like:
* Training costs for mys
p.s. by "construction work", here, I meant something like building
houses -- something I am not currently doing.
--
Raul
On Fri, Dec 7, 2012 at 9:15 AM, Raul Miller wrote:
> Why dishonest?
>
> Granted, I approximated, but there are a variety of costs here having
> to do with making sure the res
(([ ,~ -.~) 1 i.@+ >./) 1 2 4
0 3 1 2 4
or with an interesting application of under and cycle :
]&.C. 1 2 4
0 3 1 2 4
Note that if all these missing values are smaller in value than
anything in the argument list they will have
I have problems understanding this.Sorry if it is my b
Teaching J for math class in school is a great idea. The same notation
works for English class and for social studies too. The cost of entry
is steep with algebraic notation so deeply entrenched. Can the US
convert to Metric system? That's an easier task.
> Linda Alvord
> Sent: Friday, Decembe
Here's an example argument list which specifies a permutation:
9 7 8
Here's the complete permutation:
(([ ,~ -.~) 1 i.@+ >./) 9 7 8
0 1 2 3 4 5 6 9 7 8
Here's the relevance of each member of the permutation:
({. +/ .> }.)\. (([ ,~ -.~) 1 i.@+ >./) 9 7 8
0 0 0 0 0 0 0 2 0 0
Notice that e
On 07-12-12 16:58, Raul Miller wrote:
Here's an example argument list which specifies a permutation:
9 7 8
Here's the complete permutation:
(([ ,~ -.~) 1 i.@+ >./) 9 7 8
0 1 2 3 4 5 6 9 7 8
Here's the relevance of each member of the permutation:
({. +/ .> }.)\. (([ ,~ -.~) 1 i.@+ >
I do not understand your question -- which quoted sentence were you
asking about?
Thanks,
--
Raul
On Fri, Dec 7, 2012 at 11:12 AM, Aai wrote:
>
> On 07-12-12 16:58, Raul Miller wrote:
>>
>> Here's an example argument list which specifies a permutation:
>> 9 7 8
>> Here's the complete perm
In other words, it prefixes the argument list with any missing values.
Note that if all these missing values are smaller in value than
anything in the argument list they will have
just missing a period or
Anyways, once the
On 07-12-12 18:12, Raul Miller wrote:
I do not underst
On 7 December 2012 17:38, David Ward Lambert wrote:
> Teaching J for math class in school is a great idea. The same notation
> works for English class and for social studies too. The cost of entry
> is steep with algebraic notation so deeply entrenched. Can the US
> convert to Metric system? T
I am working with photographic images which use RGB color.
The array d is a single image and the array D is now 2
images but I want D to contain any number of images. And I
want split out the R,G, and B part which I can do for d, but
I am having difficulty with the analogous r, g, and b for D.
0 1 2&|: will do the job.
I recommend reading the dictionary definition of |: through a few times.
In particular, note that 0 1&|: on a rank three array is the same as
2 0 1&|: , and 0 1 2&|: turns into 3 0 1 2&|: on a rank four array.
Marshall
On Fri, Dec 07, 2012 at 03:02:49PM -0500, Brian Sch
Perfect.
Something was blocking me.
On Fri, Dec 7, 2012 at 3:28 PM, Marshall Lochbaum wrote:
> 0 1 2&|: will do the job.
>
> I recommend reading the dictionary definition of |: through a few times.
> In particular, note that 0 1&|: on a rank three array is the same as
> 2 0 1&|: , and 0 1 2&|: tu
What I find with the Python version is that with very little
modification this could have been written in Fortran or Basic back in
the early '70s with essentially the same statements- a "for" and an" if."
. Whoopee!
You could also do this with J using control structures and could show it
to yo
I haven't read the spoilers yet, so I'd like to ask a couple of clarifying
questions:
- re (Ca f p g) vs ([: f g) : must a difference be identified in the
/output/ of these two verbs when applied to identical arguments, or are
solutions allowed which show differences in products derived fr
Something I never wrapped my head around with |: is what exactly the DoJ means
when it says axes are "run together" when the LHA is boxed.
-Dan
On Dec 7, 2012, at 3:28 PM, Marshall Lochbaum wrote:
> 0 1 2&|: will do the job.
>
> I recommend reading the dictionary definition of |: through a f
Thank you for all your responses! My thoughts are:
1. Give up engineering and teach J in math classes in schools. This is not
an opportunity open to me, I'm afraid Linda, for several reasons. I think I
will serve everybody best by focusing on my particular problem and helping
my colleagues to unde
Why is it necessary to include & in each of these example?
(0 1&|:A)-:0 1|:A=:?3 2 4$5
1
(2 0 1|:A)-:0 1|:A
1
(0 1 2|:B)-:3 0 1 2|:B=:?3 2 5 4$5
1
(0 1 2&|:B)-:3 0 1 2&|:B=:?3 2 5 4$5
1
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:p
Good question Linda,
My preference, if you did not need to assign variables, would be to just use
the N V V train and so the verb test becomes
t=:((2 0 1|:])-:(0 1|:]))@:?
and you could apply it to any noun you would like.
t 3 2 4$5
1
The right inner brackets are not necessary, but I th
If you replace each expression with @: with one without it:
2.5 (>. % <. @: + * -) 4
_0.44
2.5 (>. % <. @ + * -) 4
_0.44
2.5 (>. % <. @ (+ * -)) 4
_0.4
2.5 (>. % <. @ (+ * -)) 4
_0.4
Now you can see the difference in the removal of parentheses better.
2.5 (>. % [:
Pepe,
The specification for the first puzzle is still a bit ambiguous, because:
> the equivalence fails because the execution of
> sentences involving (Ca f p g) break down when
> applied to (meaningful) identical arguments
Can apply equally to the cases I was trying to distinguish:
(1)
Hey - I am approaching this as an engineer (and ex educator) rather
than as a professional programmer. I have in the past used a variety of
languages- first was MAD (1961 at U of Michigan-credit to the Ford
Foundation which provided generous support) which was a superior Fortran
at the time, t
My problem is not how to draw dots, but the following bug in jzplot.ijs
load 'plot'
pd 'type point'
pd 2;3
pd 'show'
|length error: pdf_circle
| 'x y r'=.y
Clearly there is something going wrong somewhere in the script. I've
looked (a little) at trying to find where the diffe
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