Ditto Elijah, very nice indeed.
FYI I have not seen this done so neatly in J before now, and there is a
striking resemblance to that used in Kx (kdb+) via the “vector conditional
construct”, described here:
https://code.kx.com/q/ref/vector-conditional/
> On 30 May 2022, at 1:20 pm, Brian
I do this to get my directory a script is in:
maindir=:''
maindir=:jpathsep z{.~>:1 i:~'/\' e.~z=.;(4!:4 <'maindir'){4!:3 ''
On Mon, May 30, 2022 at 4:46 PM Jinwoo Lee wrote:
> Sorry for the confusion. You're absolutely right. :)
>
>
> On Mon, May 30, 2022 at 3:42 PM chris burke wrote:
>
> >
Sorry for the confusion. You're absolutely right. :)
On Mon, May 30, 2022 at 3:42 PM chris burke wrote:
> A .jproj file is needed to define a project directory, but it is not needed
> for folder names.
>
> A folder name is just a shortcut for a directory. If you define a folder
> name for a
A .jproj file is needed to define a project directory, but it is not needed
for folder names.
A folder name is just a shortcut for a directory. If you define a folder
name for a directory, then after moving the code to another directory, you
only need to update the folder name.
On Mon, May 30,
I actually use a slight variation of it. Because J defines '~Projects' in
the default UserFolders_j_, I usually do something like:
load '~Projects/myproj/foo.ijs'
This works most of the time but if I ever rename the project folder to
something else, I'd have to visit all such places and
Right, but it depends on what you are doing.
If writing an addon, then you could define:
path=: jpath '~addons/zerowords/tgsjo'
Otherwise, define a foldername and use that.
On Mon, May 30, 2022 at 11:33 AM Raul Miller wrote:
> On Mon, May 30, 2022 at 2:00 PM chris burke wrote:
> > But if
I usually have some similar prelude to some of my scripts.
And I dislike it. I always thought there are better ways
I am unaware of and have been too lazy to look up/ask here.
Am 30.05.22 um 18:37 schrieb Raul Miller:
Well... you could use the approach used here (lines 11 through 17):
On Mon, May 30, 2022 at 2:00 PM chris burke wrote:
> But if you want several scripts, you could load them without needing
> tgsjopath like:
>
> load 'zerowords/tgsjo/tgsjoalias'
In that example, that bit of code predates the use of the github addon
mechanism.
But, also, in some other cases we
I would put all scripts into tgsjo.ijs so that this just needs:
load 'zerowords/tgjsgo'
But if you want several scripts, you could load them without needing
tgsjopath like:
load 'zerowords/tgsjo/tgsjoalias'
The function tgsjopath extracts the full filename from 4!:3. Alternatively,
J
a=. 2 3 4 5 6 7 8 9 10 +/ .(*"4) 7 8 9 10
b=. ((*/2 3 4 5),6,(*/7 8 9 10)) +/ .(*"1) */7 8 9 10
a-:b
0
That said, it might be interesting to replace +/ with +/@,
--
Raul
On Mon, May 30, 2022 at 2:25 AM Elijah Stone wrote:
>
> That's reinforcing my point--there are no more than three
Yeah, it'd work to add my own folder to UserFolders for a specific path.
But I'd like to have a general solution that can be used in any files.
Raul's solution seems to solve the problem.
Thanks!
Jinwoo
On Mon, May 30, 2022 at 9:48 AM chris burke wrote:
> Perhaps I misunderstand, but it
Aha, 4!:3 and 4!:4 seem to be what I was missing. That's a nice trick.
Thanks, Raul!
But still, it would be nicer if J supports something like this out of the
box :)
Jinwoo
On Mon, May 30, 2022 at 9:38 AM Raul Miller wrote:
> Well... you could use the approach used here (lines 11 through
Perhaps I misunderstand, but it looks like ~filefolder is that described in
https://code.jsoftware.com/wiki/Guides/Folders_and_Projects .
Note that folders can be defined on the fly, e.g. you could run
UserFolders_j_=: UserFolders_j_,'filefolder';'/my/path'
and then:
jpath'~filefolder'
updated, please check.
On Mon, May 30, 2022 at 11:21 PM wrote:
> Hello,
>
>
> The name of the dll for the Java virtual machine on Windows needs needs to
> be corrected in jni.ijs (line 308):
>
>
>
> libjvm=. '"', '"',~ jvm, (('Darwin'-:UNAME) +
>
Well... you could use the approach used here (lines 11 through 17):
https://github.com/zerowords/tgsjo/blob/master/tgsjo.ijs#L11
I hope this helps,
--
Raul
On Mon, May 30, 2022 at 11:58 AM Jinwoo Lee wrote:
>
> When my script file loads other files that I write, it would be very
>
When my script file loads other files that I write, it would be very
convenient if we had a special jpath syntax for the folder that contains
the current file. For example, let's say my script is at /my/path/foo.ijs,
and it loads bar.ijs from the same folder.
load 'bar.ijs'
...
Or it loads
Hello,
The name of the dll for the Java virtual machine on Windows needs needs to be
corrected in jni.ijs (line 308):
libjvm=. '"', '"',~ jvm, (('Darwin'-:UNAME) +
IFUNIX){::'libjvm.dll';'libjvm.so';'libjvm.dylib'
should be changed to:
libjvm=. '"', '"',~ jvm, (('Darwin'-:UNAME) +
I had some fun learning modifier trains recently (might post about my
experiences later) and I came up with this adverb, based on Brian's second
approach (no clue how to name it as I didn't bother understanding its
purpose):
adv=: ]: (]`(*@)`(,:([.].))})
3&| adv
]`(*@(3&|))`(,: 3&|)}
3&|
On Mon, 30 May 2022, Elijah Stone wrote:
The equivalent to 'rank', then, would specify a 'root' node within each array.
(The rank conjunction, that is.)
--
For information about J forums see
Einstein Summation Notation
Not familiar with this specifically, but named axes have been suggested, and I
was discussing them with somebody recently. I think they are an interesting
idea, but do not like them; I think they are either noncompositional and
error-prone or else so incapable as
Thanks for the links to those postings by Roger and Marshall, Elijah.
During the episode Marshall does refer to Einstein Summation Notation as a
system that names the axes. https://en.wikipedia.org/wiki/Einstein_notation
The other multidimensional primitives that I can think of are Shift and
That's reinforcing my point--there are no more than three significant axes
there.
a=. 2 3 4 5 6 7 8 9 10 +/ .(*"4) 7 8 9 10
b=. ((*/2 3 4 5),6,(*/7 8 9 10)) +/ .(*"1) */7 8 9 10
a -:&, b
1
On Mon, 30 May 2022, Raul Miller wrote:
> On Mon, May 30, 2022 at 1:31 AM Elijah Stone wrote:
On Mon, May 30, 2022 at 1:31 AM Elijah Stone wrote:
> Rank is about projecting a 2- or 3-dimensional structure onto
> multidimensional arrays.
Those are common cases, but the concepts behind the notation do
support operations like:
$2 3 4 5 6 7 8 9 10 +/ .(*"4) 7 8 9 10
2 3 4 5 7 8 9 10
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