Indeed a good point Julian that is also a handy idiom for “pairwise” in J.
Note the q version also allows the null (0N) to be placed anywhere in the shape
vector, so if you knew the list had 3 groups, but weren’t sure how many items
in the group then you could also do this:
q)3 0N#args
All,
Thanks for all the help!
Hauke reminded me to use <\ to generate increasing length lists,
as well as a more concise way to remove all blanks: rab2 =: -.&'
Xash showed me the power of @, and how to avoid integer overflow to
floating point :
]m=:<\ *: >: i.15
(sep @ ". @ (,&'x') @ rab @ ": @
Using Hauke's creation of
m=: <\ *: >:i.9 NB. I used 9 instead of 15 for display purposes on the
email
I would not bother using all the character conversions, but would stay with
integers and use 10&#.^:_1 to take the digits apart. Some boxing and a Raze (;)
is required to avoid padding.
I’d want to get rid of one @ in the chain
at the expense of introducing rank
<@( [: "."0 @ ; <@":"0)\ *: >: i. 15
Am 21.08.20 um 20:22 schrieb x...@xn--wxa.land:
… and depending on what you want, there might be a better approach: parse the
numbers, raze the strings, itemize the characters, and
… and depending on what you want, there might be a better approach: parse the
numbers, raze the strings, itemize the characters, and interpret each as a
digit.
<@( [: ". @ ,. @ ; <@":"0)\ *: >: i. 15
On Fri, 21 Aug 2020 12:46:24 -0500
Skip Cave wrote:
> Definitions:
> ea =: each
>
> rab =: ]#
… and maybe you want to use
rab2 =: -.&' '
Am 21.08.20 um 20:02 schrieb x...@xn--wxa.land:
]m=:<\ *: >: i.15
(sep @ ". @ (,&'x') @ rab @ ": @ ,)each m
Appends a 'x' after each number string, so it will get interpreted as an extended
number. Otherwise big numbers get converted to floats, e.g.
]m=:<\ *: >: i.15
(sep @ ". @ (,&'x') @ rab @ ": @ ,)each m
Appends a 'x' after each number string, so it will get interpreted as an
extended number. Otherwise big numbers get converted to floats, e.g.
149162536496481100121 -> 1.49163e20.
On Fri, 21 Aug 2020 12:46:24 -0500
Skip Cave wrote:
>
I’d start with something like
<\ *: >:i.15
Am 21.08.20 um 19:46 schrieb Skip Cave:
Also, is there a better way to generate increasing length sets of a vector?
--
--
mail written using NEO
neo-layout.org
-
Definitions:
ea =: each
rab =: ]#~[:-.' '=] NB. Remove all blanks.
sep =:10 #.^:_1 ] NB. separate digits.
NB. Generate increasing lengths of integer squares & store in m:
]m=.1{.ea n,\ ea {sq=.*:n=.>:i.15
│1│1 4│1 4 9│1 4 9 16│1 4 9 16 25│1 4 9 16 25 36│1 4 9 16 25 36 49│1 4 9 16
25 36 49 64│
On 2020-08-21 10:55, 'Rob Hodgkinson' via Programming wrote:
...
q)0N 2#args
/Comment: q uses the NULL value (0N) to say “I know the
list is in pairs, so work out the rows" (hence here 3 x 2)
"Code" 33
"Name" "Iverson"
"Age” 34
The equivalent mechanism in APL or J is along these li
Small correction: '[ -: $@($,)'
On 8/21/20, Joseph Novakovich wrote:
> I would expect '[ -: $@$' to hold, which this would break.
>
> Cheers
>
> On 8/21/20, 'Rob Hodgkinson' via Programming
> wrote:
>> Henry I am just clarifying here but not advocating one way or the other
>> ….
>>
>> This featu
I would expect '[ -: $@$' to hold, which this would break.
Cheers
On 8/21/20, 'Rob Hodgkinson' via Programming wrote:
> Henry I am just clarifying here but not advocating one way or the other ….
>
> This feature is part of q (or k) and is implemented as an extension of the
> reshape function (wh
Henry I am just clarifying here but not advocating one way or the other ….
This feature is part of q (or k) and is implemented as an extension of the
reshape function (which is # in q).
Here is a q sample,
q)args:("Code";33;"Name";"Iverson";"Age";34) /Comment: Here my
list migh
Say u is your current processing
and v tells what axes are meant to look like in the result.
Then I think
(v@$ $ u) data
does the trick already. Looks like a simple conjunction to me.
If otoh you don’t know v, J won’t either.
Am 21.08.20 um 02:40 schrieb Henry Rich:
I don't think it fits into th
Any clue as to the input to summary, or what you're summarising?
Sorry if it's obvious!
Note these (display ?) errors:
pol =. _1 [space] x: ...
hp =. x [space] :: ] ...
Cheers,
Mike
On 21/08/2020 15:41, 'Bo Jacoby' via Programming wrote:
tomb=.(^/i.@>:)~ NB. tombola lottery powers
his
tomb=.(^/i.@>:)~ NB. tombola lottery powers
hist=.({."1~>:)~(*[:^/~i.@#@,)NB. histogram powers
s=.(*#)@ (}.%{.) @ (+/) NB. summation
f1=.$~2# # NB. n*n matrix
f2=.>:@i.@#, }: NB. insert S0, remove Sn
f3=.*_1^i.@# NB. change sign
f4=.|:|.!.0"01~-@i.@# NB. shift zeroes in
m=.|:@f4@(f3"1@f2@|:@f1) N
tomb=.(^/i.@>:)~ NB. tombola lottery powershist=.({."1~>:)~(*[:^/~i.@#@,)NB.
histogram powerss=.(*#)@ (}.%{.) @ (+/) NB. summationf1=.$~2# # NB. n*n
matrixf2=.>:@i.@#, }: NB. insert S0, remove Snf3=.*_1^i.@# NB. change
signf4=.|:|.!.0"01~-@i.@# NB. shift zeroes inm=.|:@f4@(f3"1@f2@|:@f1) NB.
m
Thank you!
I was trying to accomplish this
tomb=.(^/i.@>:)~ NB. tombola lottery powershist=.({."1~>:)~(*[:^/~i.@#@,)NB.
histogram powerss=.(*#)@ (}.%{.) @ (+/) NB. summationf1=.$~2# # NB. n*n
matrixf2=.>:@i.@#, }: NB. indsæt S0, fjern Snf3=.*_1^i.@# NB. change
signf4=.|:|.!.0"01~-@i.@# NB. shif
Bo Jacoby wrote:
> How to de-smell this:
> 3([* i.@#@,@[ ^/ i.@>:@])~ 0 0 1 1 1
3 (]* ((^/&i. >:)~ #)) 0 0 1 1 1
Maybe? That comes from just a little mechanical algebra:
> 3([* i.@#@,@[ ^/ i.@>:@])~ 0 0 1 1 1
First notice the repeated (i.) on either argument of (^/). There is a general
3(({."1 ~>:)~ (* [:^/~ i.@#@,)) 0 0 1 1 1
R.E. Boss
-Original Message-
From: Programming On Behalf Of 'Bo
Jacoby' via Programming
Sent: vrijdag 21 augustus 2020 12:49
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] Code smells in J
How to de-smell this:
3([* i.@#@,@[ ^/ i
How to de-smell this:
3([* i.@#@,@[ ^/ i.@>:@])~ 0 0 1 1 1
?
I tried but in vain.
Thank you!
BoDen fredag den 21. august 2020 08.18.16 CEST skrev Bo Jacoby
:
How to remove the smell (the "[" and the "]") from
3(i.@>:@[ ^/~ ])2 3 4
?
Thanks! Bo.
Den fredag den 21. august
Regarding my own J code. Code smells are
1. superfluous rank assignments on verbs. Shows that I don't know the verb
ranks well enough.
2. Over reliance on ,/ and , to get out of a "oh no my result has the wrong
shape" problem. Better to figure out why it has the wrong shape.
3. Overuse of pa
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