PNG should be a lossless format, it got compression level, but still
lossless anyways, do the quality must already bad before saving as png
files.
cairo built-in text font was a toy only, not sure if it got improvement or
not.
plot has several output formats, you may try pdf which works on jconsol
Something like this?
C=. <;._1&>',',&.><;._2 ] LF (] , [ #~ [ ~: [: {: ]) CR-.~0 : 0
1990-03-01,0.00,0.31,0.29,0.29,428800
1990-03-02,0.00,0.29,0.29,0.29,313600
1990-03-05,0.00,0.31,0.29,0.29,1395200
1990-03-06,0.00,0.31,0.29,0.29,1152000
1990-03-07,0.00,0.31,0.29,0.31,854400
1990-03-08,0.00,0.3
Hi -
I don't know how well this works on non-Win systems, but I use these:
load 'ide/qt/qtlib' NB. At least since v. 8.07
read_image=: readimg_jqtide_
write_image=: writeimg_jqtide_
These verbs are smart enough to figure out the file format from the suffix
of the name to which you write
You should probably take a look at what Jd has to ingest delimited files
like this into a database.
On Tue, Mar 31, 2020 at 12:58 AM HH PackRat wrote:
> Finishing up with function #4..
>
> I have a very large file consisting of multiple sets of historical
> stock prices that I would like to
Hi,
I'm modeling IC bed impact due to COVID-19 and I need to output a large
number of bitmaps, so png seems a good choice. However, PNG (cairo) output
results in quality loss (compared to the default option) and I was
wondering if I am missing any libraries (libcairo is installed). It's a
linux sy
For what you want to do, the "toJulian" from the J datetime library, its
inverse, and a number of other goodies there will save you re-inventing the
wheel.
load '~addons/types/datetime/datetime.ijs'
names_rgsdatetime_ 0
DATECODES J0Date Linux0DateTime MONTHS MS0Date
TIMEC
Finishing up with function #4..
I have a very large file consisting of multiple sets of historical
stock prices that I would like to split into individual files for each
stock. (I'll probably first have to write out all the files to a USB
flash drive [I have limited hard drive space, but it m
Well... let's try working through this. If it goes well, we can tackle
the others.
For this problem, we might want to use several J libraries:
https://code.jsoftware.com/wiki/Addons/tables/csv
https://code.jsoftware.com/wiki/Addons/types/datetime
https://code.jsoftware.com/wiki/Vocabulary/Printf
Continuing on to function #3.
Stock data normally consists of 6 pieces of data: date, open, high,
low, close, volume. Occasionally, early data for some stocks has no
data for the opening price of the day. One technique that some data
vendors use (in order to guarantee non-zero prices, which
On to function #2 that I need (see how-to #1 for background)
Given data set B below, moving from first to last, if the CLOSE value
(column 4) is zero, replace the zeros in columns 1 to 5 with the
preceding day's data (columns 1 to 5). Note that multiple zero rows
will therefore have the same
I need your help, please! I also hope to learn more about using J in
other contexts from your responses.
I'm writing some software to manipulate my extensive stock market data
in different ways, and I need *explicit* code (NOT tacit code) for
several functions, which I'm splitting between multipl
Dear list,
using
load 'plot'
'ylog 1' plot 1 0 3
leads to an error within the gettplog function in
jzplot.ijs, namely on its line
pos=.min+step*i.>:>.(max-min)%step
As I understand, max-min is _ , step also _ , hence the problem. Of
course, it would be nicer to issue a nicer message
Dear Devon,
Devon McCormick writes:
> |NaN error: gettplog
> | pos=.min+step*i.>:>.(max-min)%step
> |gettplog[:11]
> ...
>
> So, I am properly stopped at this point but I can't figure why my initial
> stops don't have an effect. At least the above will provide a work-around.
although t
Dear Bill,
bill lam writes:
> You can first isolate problem be related to pop up box by setting
> wdinfo_z_=: echo
> so there won't be any pop-up info box.
>
> If crash gone away then it is a jqt issue.
with
wdinfo_z_ =: echo
the crash is gone.
I get
'ylog 1' plot 1 2 0 3
++
For those of you interested in using J as an adjunct to lilypond or other such
program:
Making a few changes to the lilypond statements that get prepended and appended
to the notes generated (in my previous email on the subject). You can get
lilypond to generate a midi file of the score:
lilyp
Here are the frequencies of the 8 notes in the A major scale A (440Hz) to
octave A (880 Hz). We can compare just tuning to equal-tempered tuning,
with the frequency differences all in Hz :
N=.'A';'B';'C#';'D';'E';'F#';'G#';'A' NB. A-major scale notes
ju=._1 x:440 *1 9r8 5r4 4r3 3r2 5r3 15r8 2r1
One of the advantages of computer generated music, is that one can generate
intervals using just interval tuning (rational ratios), rather than the
equal temperament approximations used on most keyboard instruments today.
Rational ratio or just intervals are the most pleasing to the ear.
Equal tem
AbeBooks has some copies from $18.53 - $57.
https://www.abebooks.com/servlet/SearchResults?sts=t&cm_sp=SearchF-_-home-_-Results&kn=&an=&tn=Cybernetic+Music
On Mon, Mar 30, 2020 at 12:42 PM Devon McCormick wrote:
> I just bought a $32 hardback edition and now the lowest price on Amazon is
> $31.
I have the jaxitron book and have slowly been adapting the APL code to J.
Here’s what I have so far. It’s such an old book and you would need to read the
book to use the code the way it was intended.
NB. routines for cybernetic music. This is a direct translation
NB. from APL. It should be rew
I just bought a $32 hardback edition and now the lowest price on Amazon is
$31.12 for the paperback. Sorry if anyone else wanted one for cheap.
On Mon, Mar 30, 2020 at 11:56 AM Raul Miller wrote:
> I wish I did... but I was on a different page (where the price has now
> dropped to $814):
>
> ht
I wish I did... but I was on a different page (where the price has now
dropped to $814):
https://www.amazon.com/Cybernetic-Music-Jaxitron/dp/0830608567
FYI,
--
Raul
On Mon, Mar 30, 2020 at 10:45 AM Mike Powell wrote:
>
>
>
> > On Mar 30, 2020, at 07:04, Raul Miller wrote:
> >
> > Hmm...
> >
> On Mar 30, 2020, at 07:04, Raul Miller wrote:
>
> Hmm...
>
> Currently only $854 for a paperback copy of Cybernetic Music from
> Amazon ($34 for hardcover, though (and $14 for a paperback copy from
> Albris -- plus $4.80 for tax and shipping...)).
I think you meant $8.45 for the Amazon pap
Hmm...
Currently only $854 for a paperback copy of Cybernetic Music from
Amazon ($34 for hardcover, though (and $14 for a paperback copy from
Albris -- plus $4.80 for tax and shipping...)). Maybe I'll try my
hand at translation, or something...
(Meanwhile, Lisp can be translated to J fairly easi
On 3/28/20, Devon McCormick wrote:
> has anyone done work with generating music or musical phrases in J? I'm
> helping someone develop a music training game that starts by generating
> sounds with a particular key, tempo, and phrase length. ...
> I've told my collaborator that I think the generat
24 matches
Mail list logo
