Several kinds of issues intersect here.
One issue is of course the existing implementations of J. As we have
seen, the implementation for imposing rank on a verb involves
sequential processing.
One issue is machine architecture. Historically, J has been
implemented on a CPU architecture -- it's d
You were right
It was my misunderstanding.. Done!
Raul Miller-4 wrote:
>
> On Tue, Sep 11, 2012 at 12:50 PM, pascha wrote:
>> Thanks.. "row_number" works
>> But now the problem is I want the verb to iterate over one array at a
>> time.
>> for example if I do proccess"0(1+i.2) the resultant inp
An interesting and potentially useful ambiguity here is that
process"0 (1+i.2)
conceptually (as I understand it) processes the two arguments
simultaneously but actually processes them serially as it is written
in Raul's example. One reason this is interesting is that you could
write "process"
Hi Pascha,
If you haven't looked at Henry Rich's 'J for C Programmers', specifically
Chapter 5 http://www.jsoftware.com/help/jforc/declarations.htm#_Toc191734319
and Chapter 6
http://www.jsoftware.com/help/jforc/loopless_code_i_verbs_have_r.htm#_Toc191734331
I think that is an excellent start
On Tue, Sep 11, 2012 at 12:50 PM, pascha wrote:
> Thanks.. "row_number" works
> But now the problem is I want the verb to iterate over one array at a time.
> for example if I do proccess"0(1+i.2) the resultant input is:
>
> /home/user/input/filename1.pgm
> /home/user/input/filename2.pgm
Not exact
Thanks.. "row_number" works
But now the problem is I want the verb to iterate over one array at a time.
for example if I do proccess"0(1+i.2) the resultant input is:
/home/user/input/filename1.pgm
/home/user/input/filename2.pgm
what I want is to "separately" process each array. In the first iter
Right, the main problem for me is I've troubles to understand iteration of
verbs over array dimension
any suggestion for tutorial?
aks_sba wrote:
>
> Pascha,
>
> The people who have been responding are trying to help you understand the
> "j way" to get your problem addressed. In other words, t
If I understand what you wrote, you want something like this:
require'files'
process=: 3 :0
row_number=. ":y
input=: fread '/home/user/input/filename', row_number ,'.pgm'
NB. insert here, some calculations which define output as a sequence
of characters
assert. 1=#$output
assert. ' ' =
The reason I mention triples is because each argument consists of an
input directory, an output directory, and a table. The example
arguments show two of each to give you two triplets.
On Mon, Sep 10, 2012 at 4:34 PM, pascha wrote:
>
> If I understood correctly you've included two 'inputd' and t
'\in1';'\in2' is a list of two input directories; '\out1';'\out2' are
two output directories.
On Mon, Sep 10, 2012 at 4:34 PM, pascha wrote:
>
> If I understood correctly you've included two 'inputd' and two 'outputd' and
> a table which makes it rather complicated for me. If that is right could
Pascha,
The people who have been responding are trying to help you understand the "j
way" to get your problem addressed. In other words, they have been showing you
how to solve the problem using "loop less" J sentences.
In order for you to really understand these helpful suggestions, you have t
could I put it into simple form:
I'd like to write a verb that reads and process "each" row of a table (50 x
8) with the condition that this verb calls for two other verbs (read and
write) which they need a specific path. The problem is that how can I read
this table row by row and number the pat
I'm struggling to understand exactly what you are trying to achieve
but am assuming it just involves processing a set of files. If so then
something like this might work.
Create a 2 column table of outfilenames ,. infilenames. It doesn't
really matter how you do this but for clarity here's an exam
Yes, you're right. I said "one by one" cause I suppose the limitation doing
so. I get the so-called "limit error", (overly large resultant). That's why
I turned back to one-by-one manner. I am sure that you would find another
strategy to do so but that's the only way I can think of for the moment.
If I understood correctly you've included two 'inputd' and two 'outputd' and
a table which makes it rather complicated for me. If that is right could you
make it for one 'inputd' and one 'outputd' and a table?
if I am worng what are 'in1','in2' and 'out1' and 'out2'?
Devon McCormick wrote:
>
>
Well... J does have control structures, though only in explicit verbs
(and explicit adverbs and explicit conjunctions):
http://www.jsoftware.com/help/dictionary/ctrl.htm
That said, when you say "one by one" it's usually a good idea to say
why you want to do things that way. "One by one" processin
Here are a couple of ways to do what you want. Each of these expects
a triplet (input dir; output dir; table) and an arbitrary verb to
apply.
workOnDirs=: 1 : 0
'inpd outpd table'=. y
table u inpd;outpd
NB.EG foo workOnDirs &.> ('\in1';'\in2');&.>('\out1';'\out2');&.>tables
)
So, the input
I am quite unfamiliar with the concept of loop in J.
what I meant about loop was the traditional "for loop" as in other
languages, I even don't know if such a thing exists
I'd like to apply two path variables (one for reading and one for writing)
and one other table (these 3 have the array size)
Here are your 50 paths:
paths=: ('/home/user/file', ":, '.pgm'&[)&.> 1+i.50
If you have a verb which reads one file and processes it, and returns
that result, you might use either:
averb each paths
or
averb"0 paths
The first version gives your verb an unboxed file name, the second
versi
I want to include path variable for a verb which reads several files in a
loop
as an example:
path = '/home/user/file'
x=: read path,i,'.pgm'
in which "read" is the verb, "i" starts from 1 to 50 and '.pgm' is the file
extension.
so in each iteration "i" would replace with number 1-50.
is this
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