A new version of the stats/base addon has been released.
It includes the following new verbs:
quantiles vquantiles of y at the specified probabilities x
nquantiles v values which partition y into x quantiles
iqr v inter-quartile range (IQR) of y
ntiles v assign values of y to
https://adventofcode.com/2021/day/20
For day 20, our puzzle was to use "image enhancement" on a "map"
obtained by our sensor/beacon arrangement.
Our email system is going to wrap lines here, so keep in mind that
there's only a single line before the blank line in this data sample:
sample=:{{)n
.
I should perhaps clarify -- since there's no actual physical
coordinates involved here. I am using "left handed" and "right handed"
to refer to what should maybe be labeled as the parity of the axes of
the coordinate system.
I really need better vocabulary for talking about these distinctions.
Th
Also, ... I believe that that cross product is a right handed cross
product. It would be interesting to think about what would need to
change to make a left handed cross product work (for example, the
cross product implementation in the complete tensor essay in the
wiki).
(I had thought that I was
Il giorno 9 gennaio 2022, alle ore 20:56, 'Michael Day' via Programming
ha scritto:
>Chat really, but I think it still belongs here.
>I've just had another look at the performance stats for day 19. The numbers
>solving parts 1 & 2 are 15420 and 236, respectively., at the time of
>typing.
>Weir
Oops, I thought I had included that in my message. My apologies:
NB. from https://code.jsoftware.com/wiki/Phrases/Matrices
cross=:(1 _1 1 * 1 (-/ . *)\. ])@,.
Good question, thanks.
--
Raul
On Sun, Jan 9, 2022 at 9:49 AM 'Michael Day' via Programming
wrote:
>
> Raul, would you mind defining
I see several issues here.
First off, I should point out that you have some useless code in your
leftR and in your rightR implementations. These do not affect the
outcome, but do influence readability. Here's my rephrasing with that
useless code removed:
leftR=: {{
x * (0{y) + 1{y
}}
rightR=:
Chat really, but I think it still belongs here.
I've just had another look at the performance stats for day 19. The numbers
solving parts 1 & 2 are 15420 and 236, respectively., at the time of
typing.
Weird - once you've done part 1, there's hardly anything further to do
in part 2 !
Perhaps
Floating-point addition is not associative or distributive. It looks
like you have some roundoff error that is greater than the comparison
tolerance but less than the print precision.
Henry Rich
On 1/9/2022 12:23 PM, Pawel Jakubas wrote:
Dear J users,
I am testing very simple multiplication
Dear J users,
I am testing very simple multiplication property:
s (A+B) = sA + sB
using emulated property testing (more on this here
https://github.com/paweljakubas/j-random-matrices/blob/main/chapters/algebra.md#testing-matrix-properties
)
So basically I am doing something like this:
NB. picking
Dear J users,
I am testing very simple multiplication property:
s (A+B) = sA + sB
using emulated property testing (more on this here
https://github.com/paweljakubas/j-random-matrices/blob/main/chapters/algebra.md#testing-matrix-properties
)
So basically I am doing something like this:
*runiform=:
I have begun to punt on the aoc about here.
Even with this part a solution I got frustrated thinking about the parsing
of "operator" packets even on part a. Your explanation and code is very
informative. For example in this day 16 question the snippet below was very
satisfying because I could not s
Raul, would you mind defining cross? I've tried */ and (+/ . *) but
neither seem to
work for me, and I'm not sure what you mean.
As I said a few days ago, I gave up wondering why I'd found 48
rotations when they
asked for 24, couldn't grasp what the meant by facing" and resorted to
matr
Here's a better 'relori', in my opinion:
NB. y: scans from two scanners
relori=: {{
sigs=: signature each y
upsigs=: 0-.~(~. #~ 2 = #/.~) ;~.@,each sigs
masks=: (* wrote:
>
> https://adventofcode.com/2021/day/19
>
> Like a variety of my work on previous days, my code here is rather
> bulky.
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