Sorting the result suggests this amendment to save one transpose:
shist =:|:@(/:~@~.,.#/.~)
Cheers,
Mike
Sent from my iPad
> On 19 Oct 2021, at 13:00, Raul Miller wrote:
>
> ~. and #/.~ maintain the order of their argument.
>
> So this is one approach:
>
> hist=: ~. ,: #/.~
> n=:?100#
~. and #/.~ maintain the order of their argument.
So this is one approach:
hist=: ~. ,: #/.~
n=:?100#20
hist/:~ n
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
2 6 2 4 4 7 3 9 3 6 7 4 1 4 8 3 9 3 10 5
You can also sort the result, of course:
/:~&.|: hist n
0 1 2 3 4 5
Hi Skip,
I would do it as follows:
hist1 =: bins ([,: _1 + #/.~@,) ]
bins =: i.@:>:@(>./)
this basically prepends the expected bins to the data, and subtracts one
(_1 +) from the count.
The definition of the bins might need to be adapted, based on your data;
now it simply take 0 - highest elemen
How can I modify the standard implicit histogram verb to produce sequential
categories?
hist =:~.,:#/.~
]n=.?100#20
9 12 3 14 3 13 18 8 12 17 17 14 19 9 18 18 16 12 2 4 4 5 13 16 14 11 9 17 8
4 14 19 2 9 3 9 7 6 15 14 1 13 14 13 13 19 13 1 4 16 11 12 19 4 2 1 3 18 10
15 6 5 10 14 9 3 8 19 14 5 1
Perfect upgrade!
histogram does not lead to lost data any more.
_5 0 5 histogram _2 _7 0 3 9
1 1 2 1
Thanks, Ric, for all future users.
~ Gilles
Le 2021-05-19 à 08:01, Raul Miller a écrit :
Yes.. I should have been reading the updated code, rather than the commits.
It's been too long sin
Yes.. I should have been reading the updated code, rather than the commits.
It's been too long since I did anything serious with github.
Sorry about the noise.
Thanks,
--
Raul
On Wed, May 19, 2021 at 6:12 AM Ric Sherlock wrote:
>
> Hi Raul,
> The pull request is named "Update histogram to co
Hi Raul,
The pull request is named "Update histogram to correctly count items in
last bin" and links to Issue #4 (
https://github.com/jsoftware/stats_base/issues/4) that was filed in the
repository called "histogram doesn't count all the data". That mentions the
problems to be addressed and also li
Details would be nice in the commit message. "corrected" doesn't
really explain the issue. But I guess that's just a suggestion for
later.
Looking at the implementation itself, I don't remember what situation
the 'NB. The number of points in the last interval is undercounted by
1' is good for. I
I've made some changes to stats/base in this Pull request
https://github.com/jsoftware/stats_base/pull/5
Any suggestions/objections?
Changes are basically:
* the current version of histogram is replaced with histogram2 (also
called histogramL)
* histogram1 is added as histogramR
* added Idotr
Gilles,
Both histogram1 and histogram2 can be plotted with the bar type, which I
believe has colored bars.
The problem being addressed mostly with the verb named 'relative' on the
wiki page is the situation where the bins are of different width. In that
case I could only find a line type drawing
Thanks to Brian and Ric for their major improvements and in particular
for Brian's Histogram wiki page. I was neither asking nor hoping for so
much.
Both are interesting. I find specially useful the visual representation
of the importance of each interval.
If there was a way to paint interva
Combining the Brian's ideas with the Rosetta code solution, I came up with
this adverb which I quite like:
Idotr=: |.@[ (#@[ - I.) ]
binnedData=: {{
bidx=. i.@>:@# xNB. indicies of bins
x (Idotr (u@}./.)&(bidx&,) ]) y NB. apply u to data in bins after
dropping first val
Good question Brian and interesting discussion.
I agree that the key to the problem is to agree exactly what the desired
behaviour of histogram should be.
Mathematical/statistical convention seems to be that Intervals should be
closed on the left and open on the right. This makes life a bit harder
As you thought, Steve Jost kindly confirmed.
I had never heard of the upper bin being treated differently.
On Sat, Apr 10, 2021 at 1:59 PM Raul Miller wrote:
> I give the english sentence precedence over the label for a specific
> row in a table.
>
> For the example treated by that table, it doe
I give the english sentence precedence over the label for a specific
row in a table.
For the example treated by that table, it does not change the numbers.
That said, I suppose it would be worth talking with Steve Jost about
this issue. He likely has references worth reading that lead him to
writ
Raul,
Notice that at your link the uppermost interval is
specified differently in paragraphs (1.) and (2.).
In the former, [80,100]; latter, [80,100) . So,
which does it mean?
Also, notice the results below.
20*i. 6
0 20 40 60 80 100
(20*i. 6) histogram 5 39 75 79 85 90 91 93 93 9
P.S. here's an implementation which satisfies that "Except for the
last interval, each interval is closed on the left and open on the
right." specification:
histogramFixed=: #@[ {. <:@(#/.~)@(i.@#@[ , I.)
Thanks,
--
Raul
On Sat, Apr 10, 2021 at 10:09 AM Raul Miller wrote:
>
> Here's how I mig
Here's how I might fix histogram based on Gile's suggestions:
histogram=: (}.~0-0={:)@:<:@(#/.~)@(i.@>:@#@[ , I.)
This is a brute force approach: add an extra tally bucket and discard
it if it's empty.
But I think that this is not the correct approach. It seems to me that
there ought to be a tes
Like Devon, "I have noticed some oddities," and have described my
variations at the following link.
https://code.jsoftware.com/wiki/User:Brian_Schott/Histogram
Below using spacing to emphasize similarities and differences in 3
definitions, I have tried to restate the definitions so that a
non prop
I have noticed some oddities here too but mostly have ignored them and
adjusted my plots to compensate. I mostly use my own variant
"plotHistoMulti" - here:
https://code.jsoftware.com/wiki/User:Devon_McCormick/myStats - but have not
yet nailed down exactly what is off with the underlying.
On Sat,
About the histogram verb in stats/base
NB. The result is a list of counts of the number of data points in each
interval.
Intervals are specified by the left argument. histogram uses dyadic I.
The I. primitive defines (1+#x) intervals. See its clear definition
in Nuvoc. In short, it
I think the essay presumes your range was chosen to include all values
in your range.
Thanks,
--
Raul
On Thu, Jun 15, 2017 at 8:35 AM, Rudolf Sykora wrote:
> On 15 June 2017 at 14:14, Brian Schott wrote:
>> Rudolf,
>>
>> Have you seen the following comments which attempt to alter that Essay?
On 15 June 2017 at 14:14, Brian Schott wrote:
> Rudolf,
>
> Have you seen the following comments which attempt to alter that Essay?
I haven't, I did not know about it. I will read it. Thanks!
Anyhow, I still believe the original essay should be improved (if I am
not completely
wrong with my unde
Rudolf,
Have you seen the following comments which attempt to alter that Essay?
http://code.jsoftware.com/wiki/User:Brian_Schott/Histogram
--
For information about J forums see http://www.jsoftware.com/forums.htm
From: Rudolf Sykora
To: programm...@jsoftware.com
Sent: Thursday, June 15, 2017 7:50 AM
Subject: [Jprogramming] histogram from Essays
Hello,
I found a code to produce a histogram at
http://code.jsoftware.com/wiki/Essays/Histogram.
However, both the description
Hello,
I found a code to produce a histogram at
http://code.jsoftware.com/wiki/Essays/Histogram.
However, both the description and the function seem odd.
The code reads
histogram=: <: @ (#/.~) @ (i.@#@[ , I.)
1)
They say: ---The left argument is a list of interval *start* points.---,
which I t
Slightly off topic is the stemplot described in Moore and McCabe,
Introduction to the Practice of Statistics.
Below you can see the data item 17 in row 1 and the data item 133 in row 13.
data
17 133 151 47 12 19 52 80 32 87 24 14 20 90 9 47 72 7 36 64
stemplot data
0|7 9
1|2 4 7 9
Roger Hui and I have both studied histograms and you can find my discussion
at the following link where the following verbs are defined.
http://code.jsoftware.com/wiki/User:Brian_Schott/Histogram
To make a long story shorter, my result differs from yours and Roger's when
the sample value of 4 cha
Thank you, didn't know about interval index.
Sun, 8 May 2016 19:27:32 +0800
bill lam :
> It is called interval index (dyad I.), please see help
> documentation for detail.
>
> 2.5 5 7.5 I. 1 3 3 3 4 7 7 8 8 9
> 0 1 1 1 1 2 2 3 3 3
> #/.~ 2.5 5 7.5 I. 1 3 3 3 4 7 7 8 8 9
> 1 4 2 3
>
>
>
This suggests the verb
2.5 5 7.5 #/.~@:I. 1 3 3 3 4 7 7 8 8 9
1 4 2 3
but there is a problem: if an interval has no members, it doesn't show
as 0, but instead is omitted:
0.5 2.5 5 7.5 #/.~@:I. 1 3 3 3 4 7 7 8 8 9
1 4 2 3
to make sure every interval has a corresponding count, use
0
It is called interval index (dyad I.), please see help
documentation for detail.
2.5 5 7.5 I. 1 3 3 3 4 7 7 8 8 9
0 1 1 1 1 2 2 3 3 3
#/.~ 2.5 5 7.5 I. 1 3 3 3 4 7 7 8 8 9
1 4 2 3
Вс, 08 май 2016, dahn oak написал(а):
> Hello, I want to mimic this Mathematica code:
>
> BinCounts[x,
Hello, I want to mimic this Mathematica code:
BinCounts[x, {div}]
It returns an array where i-th element is a count of elements in x that
belongs to interval [div_i, div_i+1).
I've succeeded, but want to know if my soulution is adequate enough in terms
of J programming style. Here it is:
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