Brilliant, thank you all. I like the 2!:0 'cat /dev/urandom|od -N4 -An -i'
most as I find it easily intelligible, but _everyone_ has been extremely
helpful. I'm impressed.
True confessions: I likely won't make _major_ use of /dev/random but I
wanted to get it working. I will share the knowledge. I
Have you tried putting a sparse array in a box?
I wonder if this kind of stuff will be causing memory leaks or other
such thing...
(I also wonder how to explain this kind of thing to new people.)
--
Raul
--
For information abou
Thanks to Ric and Brian for their references.
Here is my verb stemplot, which assumes non-negative integer data,
begins by trimming x digits from the data, and assumes there will be at
most three digits in the stem.
stemplot =: 4 : 0 NB. usage trim stemplot data
trimy =: <. y % 10 ^ x NB.
Hi Jose,
I like Conjunction-adverb and adverb-verb. Nice. Need to dig into that
recursive 103!:0 to get a feel for it. Encouraging work though. Thanks
for making these changes available to us.
-Steven
On 14 March 2013 11:41, Raul Miller wrote:
> Have you tried putting a sparse array in a
I am not sure that negative numbers are consistent with stem and leaf plots.
That said, you could use an existing mechanism by manipulating the
numbers before handing them off. For example:
fudge=: ] + 0&> * (_20 * 0 = 10&|) - 10 2&p.
--
Raul
On Wed, Mar 13, 2013 at 5:16 PM, Brian Schott w
Negative numbers in stem and leaf plots are discussed here:
http://en.wikipedia.org/wiki/Stem-and-leaf_display
--Kip
Sent from my iPad
On Mar 14, 2013, at 8:00 AM, Raul Miller wrote:
> I am not sure that negative numbers are consistent with stem and leaf plots.
>
> That said, you could use
I think the current wikipedia discussion of this topic is not self consistent.
Earlier on the page, we see that 76 is interpreted as a stem of 7 and
a leaf of 6, and 88 is interpreted as a stem of 8 and a leaf of 8.
In the treatment of negative numbers, the stem for X is expressed as
X/10, with n
That said, I doubt that SAS's implementation represents the symmetry
which is present here:
5*i:5
_25 _20 _15 _10 _5 0 5 10 15 20 25
Perhaps it would be worthwhile documenting the SAS stem and leaf
algorithm, though, since it is "prestigious"?
Thanks,
--
Raul
On Thu, Mar 14, 2013 at 9:48 A
Classical stem and leaf uses truncation not rounding, to make it easy to look
up values in the original data. For the wiki data
-23.678758, -12.45, -3.4, 4.43, 5.5, 5.678, 16.87, 24.7, 56.8
you can truncate to the integer part and get (here done by hand)
-2 | 3
-1 | 2
-0 | 3
+0 | 4 5 5
On Thu, Mar 14, 2013 at 3:47 PM, km wrote:
> Classical stem and leaf uses truncation not rounding, to make it easy to look
> up values in the original data. For the wiki data
...
> You cannot show the symmetry in i: 12, which classically would probably
> appear as (again done by hand, t f s e a
Raul,
My understanding is that the stems are never rounded, but the leaves
may be rounded to so that their displayed leaf is an integer.
I mentioned SAS before. SAS allows the use of stems that are either
X%10 5 2, I believe. I believe my version also allows such.
On Thu, Mar 14, 2013 at 10:40 A
On Thu, Mar 14, 2013 at 4:23 PM, Brian Schott wrote:
> I mentioned SAS before. SAS allows the use of stems that are either
> X%10 5 2, I believe. I believe my version also allows such.
Some examples would be good, to resolve the questions this raises for
me. i:12 and 0.1*i:12 are probably good v
For i:12 you can do
-1 | 2 1 0
-0 | 9 8 7 6 5 4 3 2 1
+0 | 0 1 2 3 4 5 6 7 8 9
1 | 0 1 2
but variants of the stem and leaf display are available, for example
-1 | 2 1 0
* | 9 8 7 6 5
-0 | 4 3 2 1
+0 | 0 1 2 3 4
* | 5 6 7 8 9
1 | 0 1 2
in which final digits 0
Raul,
Here are some examples from my version. I no longer have access to SAS.
Granted that 0.1*i:12 takes some preprocessing.
pretty SL >.0.1*i:12
_0 | 1110
0 | 01122
pretty 2 SL >.0.1*i:12
_0 | 1110
0 | 011
2 | 22
pretty 5 SL i: 12
No, I have not tried putting a sparse array in a box.
How to explain this kind of thing to new people? I cannot even explain a
few things to myself! Arguably this is not J, or at least it is not the
way J was meant to be; yet, I find this temptation irresistible... (by the
way, the extension wl
Given the various definition here, I think I'd implement stem and leaf
plots like this:
stem=: }:@":&.>
leaf=: {:@":&.>
stemleaf=:2 :0
y=./:~ y
s=. u y
(,.>~.s) ; >s <@;/. v y
)
Example (using >,./ to avoiding boxes because email clients mishandle boxes):
,./ >stem stemleaf leaf i:12
I saw these operators, 0: and 2: in some code, and I can't quite make
out what they do, nor can I find any documentation.
Any suggestions?
--
For information about J forums see http://www.jsoftware.com/forums.htm
http://www.jsoftware.com/help/dictionary/dconsf.htm
... peter
On 03/14/13 18:40, Alex Giannakopoulos wrote:
I saw these operators, 0: and 2: in some code, and I can't quite make
out what they do, nor can I find any documentation.
Any suggestions?
Thanks Peter, thought that might be the case, but I couldn't be quite sure.
You know, I tried looking in the J dictionary for "constant functions", but
there was no entry for them on the first page!
On 15 March 2013 01:43, Peter B. Kessler wrote:
> http://www.jsoftware.com/help/**dictionary/dco
In j64-701gtk (under windows at least) typing 2: at the prompt and then
doing CTRL-F1 takes you directly to that dictionary page. That's the way
you get context sensitive help in J Term. But that's not supported yet in
latest jqt.exe (j64-801 beta).
On Thu, Mar 14, 2013 at 9:06 PM, Alex Giannako
One can print out that page as a cheat sheet.
That page was the back cover of the printed DOJ.
Чт, 14 мар 2013, Greg Borota писал(а):
> In j64-701gtk (under windows at least) typing 2: at the prompt and then
> doing CTRL-F1 takes you directly to that dictionary page. That's the way
> you get cont
At the bottom of the Vocabulary page you can see the entry
_9: to 9: Constant functions
I always have the Vocabulary page
http://www.jsoftware.com/docs/help701/dictionary/vocabul.htm
as the first tab on my Chrome browser!
You can make any noun a constant function whose only value is the noun b
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