In response to a similar question I asked a few years ago Roger Hui's
response introduced me to the outstanding j essays. Start from the
odometer essay:
http://www.jsoftware.com/jwiki/Essays/Odometer
On 12/11/2013 11:50 AM, programming-requ...@forums.jsoftware.com wrote:
Date: Wed, 11 Dec 2
If your multi-line file is clean (last character is a newline), use:
csv_parser;._2
Thanks,
--
Raul
On Wed, Dec 11, 2013 at 7:39 PM, Tom Arneson wrote:
> I just tried the Finite State Machine parser from the url below. It doesn't
> correctly parse multi line csv files. Can someone sugge
Here's another option.
a=:>:i.250
b=:>:?100#250
f=: 13 :'+/"1 x=/y'
(>:i.250) f >:?100#250
(>:i.250) f >:?100#250
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Kenneth
Le
I just tried the Finite State Machine parser from the url below. It doesn't
correctly parse multi line csv files. Can someone suggest changes so it will?
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Devon
I'm not sure of the purpose of a. If the list only needs to be sorted then
the following is faster and also gives a 2 column array with the first
column being what a should be and the second column the count.
/:~({.,#)/.~b
On Wed, Dec 11, 2013 at 2:56 PM, Thomas Costigliola wrote:
> Don, th
Don, that will still count duplicate values of b not in a, the count will
just be off by one. You can just ignore those afterwards though:
count1=. (#@[ {. <:@#/.~@,)
Or you can filter before counting:
count2=. ([:<:[:#/.~,#~[e.~,)
ts=: 6!:2,7!:2@] NB. time & space
a=: >: i.10
b=: ?100
Here is another way.
<:#/.~a,b
This produces a zero count for values of b not in a.
On Wed, Dec 11, 2013 at 11:30 AM, Ni Bo wrote:
> Thank you. Will try it later on the data.
>
> Nick
> Am 11.12.2013 20:16 schrieb "Kenneth Lettow" :
>
> > How about
> >
> >a=: 1 2 3 4 5 6
> >b=: 14
Thank you. Will try it later on the data.
Nick
Am 11.12.2013 20:16 schrieb "Kenneth Lettow" :
> How about
>
>a=: 1 2 3 4 5 6
>b=: 14 3 2 5 6 2 1 1 2 3 4 2 3
>+/"1 (a=/b)
> 2 4 3 1 1 1
>{:"1 /:~(~.,#)/.~(#a)-.~a i. b
> 2 4 3 1 1 1
>NB. make it a verb
>doit=: 4 : '{:"1 /:~(~
How about
a=: 1 2 3 4 5 6
b=: 14 3 2 5 6 2 1 1 2 3 4 2 3
+/"1 (a=/b)
2 4 3 1 1 1
{:"1 /:~(~.,#)/.~(#a)-.~a i. b
2 4 3 1 1 1
NB. make it a verb
doit=: 4 : '{:"1 /:~(~.,#)/.~(#x)-.~x i. y'
a doit b
2 4 3 1 1 1
NB. larger args
a=: >: i.10
b=: ?1$20
a d
If you want to inspect data and especially if there are invisible chars it
can be good to use a. i.
Like here when I copied text from the message:
a=. ('1,2,"embedded, comma",3.4',CR,LF,'5,6,"no comma",7.8')
|spelling error
|a=. ('1,2,"embedded, comma",3.4',CR,LF,'5,6,"no comma",7.8')
|
Hi,
I'm using the data off the kaggle competition to learn some j.
This simple code works for these short strings:
a=:1 2 3 4 5 6
b=:14 3 2 5 6 2 1 1 2 3 4 2 3
+/"1 (a=/b)
2 4 3 1 1 1
But if I try it for longer strings #a 250 and #b 1 000 000 I get out of
memory.
Can you please help me with
Exactly. So simple.Thanks!
> Date: Wed, 11 Dec 2013 11:43:15 -0500
> From: klet...@thomasnet.com
> To: programm...@jsoftware.com
> Subject: Re: [Jprogramming] J and Group Theory
>
> Is this what you need?
>
>#:i.4
> 0 0
> 0 1
> 1 0
> 1 1
>'a b c d'=: #:i.4
>a
> 0 0
>b
> 0 1
>
Is this what you need?
#:i.4
0 0
0 1
1 0
1 1
'a b c d'=: #:i.4
a
0 0
b
0 1
c
1 0
d
1 1
On Wed, Dec 11, 2013 at 11:36 AM, Jon Hough wrote:
> Hi,
>
>
> I saw in the J labs the example for the group Z_4 (cyclic group of order
> 4).
>
>
>
> I am now trying to ape this method to c
Hi,
I saw in the J labs the example for the group Z_4 (cyclic group of order 4).
I am now trying to ape this method to create the group Z_2 x Z_2 (direct
product of cyclic group order 2 with itself).
This is what I have done so far:
a =: 0 0
b =: 0 1
c =: 1 0
d =: 1 1
f =:
Thanks for the replies. It's going to take a while to take all this in.
Regards,
Jon
> Date: Tue, 10 Dec 2013 11:38:30 -0500
> From: devon...@gmail.com
> To: programm...@jsoftware.com
> Subject: Re: [Jprogramming] Beginner Understanding CSV file reading/writing
>
> You may also want to look at
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