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
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 http://www.jsoftware.com/forums.htm
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&|
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) +
IFU
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 baz.ij
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
> convenient
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) +
> IFUNIX){::'libjvm.dll';'libjvm.so';'libjvm.dylib'
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'
/m
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 17):
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 looks
a=. 2 3 4 5 6 7 8 9 10 +/ .(*"4)&i. 7 8 9 10
b=. ((*/2 3 4 5),6,(*/7 8 9 10)) +/ .(*"1)&i. */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 t
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 itself
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 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):
https://g
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 y
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 updat
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, 20
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 dir
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:
>
> >
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 Schot
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