Re: [Jprogramming] [Jchat] J by point and click Lab

Henry Rich Sun, 24 Jan 2021 19:02:04 -0800

I don't get to the same conclusion. I don't see how any dissect or labserror could cause a state where 2!:55'' typed into the term window wouldbe ignored. The only way would be if they did a 1!:1]1 prompt, whichthey don't do. So Jqt must not be passing the command to JE.

What might be different between the working and non-working cases youmentioned is debug suspension. If the lockup happens during suspension,check that path in Jqt and see if it is possible that inputs are notbeing passed to JE.


Henry Rich

On 1/24/2021 9:39 PM, bill lam wrote:

I can duplicate the same issue of plot hanging J on linux.
I also tried starting a fresh session of jqt and then firing up debug
window (ctrl-K), and then type
require 'plot'
plot i.10

and this ran fine.

and then I tried again the lab and stopped at section 3/5 (the frame just
before the plot) and I typed manually in the term session,
require 'plot'
plot i.10

and it hangs.

So I suspect this is a dissect or labs issue.


On Mon, Jan 25, 2021 at 4:08 AM 'robert therriault' via Programming <
[email protected]> wrote:

Well this lab is certanly putting my system through its paces.

The latest is something that only happens in j 902 and j 903. j 901 and
before is unaffected.

When you get to chapter 2 section 4 of 'J by point and click' a plot
window opens up. Everything displays properly, but although you can type
into the terminal window, nothing will execute and the j application has to
be force quit.
When the plot window first opens a 0 shows up in the terminal window,
followed by the 3 space indent on the next line. After that whenever you
click on the plot window an additional 0 is added one line down
right on the margin. Clicking back and forth between the terminal and the
plot window just adds more of these zeros.

I thought that it may have something to do with the {{ }} issues that
R.E.Boss has been experiencing recently on a different thread so I tried
adding lines around the plot command in the .ijt file but that did not seem
to make a difference.

I have also found that if you have debug activated that a plot command
will cause 0's in the terminal window, but this does not lock up J.

Overall a bit of a concern as 'J by point and click' is a really good
intro lab and having it result in a force quit for a new user is
problematic.

Any suggestions would be welcome.

Cheers, bob

     JVERSION
Engine: j902/j64avx2/darwin
Release-a: commercial/2020-12-05T12:43:38
Library: 9.02.08
Qt IDE: 1.9.2/5.12.10(5.12.10)
Platform: Darwin 64
Installer: J902 install
InstallPath: /users/bobtherriault/j902
Contact: www.jsoftware.com

On Jan 23, 2021, at 10:02, 'robert therriault' via Chat <

[email protected]> wrote:

Thanks Henry, that worked for me.

I am guessing from the style of the lab that you were the author. It

really is very good. I was thinking of doing a video series of screencasts
following along the lab and pointing out the tools that are shown and why
they are important to learn as a newcomer to the language. Do you have any
concerns/suggestions about how you would like to see this done?

I am cross posting to chat so that you can follow up the thread there,

since this is not really programming.

Cheers, bob

On Jan 23, 2021, at 08:04, Henry Rich <[email protected]> wrote:

I have pushed a change that might be a fix. Update your Dissect addon.

The mouse-move routine returned a value that was being displayed. I

changed it to return i. 0 0.  That made the 0s go away for me. I think the
display is probably only when debug is on, and was introduced toward the
end of 9.02 development.  Normally the results of event handlers are not
displayed, but for debug they are passed into the suspension handler which
then displays them.

Henry Rich

On 1/23/2021 12:09 AM, 'robert therriault' via Programming wrote:

I was going through the J by point and click lab and noticed that

there is a problem with the dissect window in j902 and j903. Whenever I
move the mouse over the dissect window a sequence of 0's races down the
page of my term window. I don't see this behaviour j901 or earlier.

Is this happening for anyone else?

I had been hoping to run a series of videos based on this lab to

provide an easy entry to J from the masses, but would not want to do that
if it not reliable across versions.

Was this lab yours Henry? It is a very good introduction.

Cheers, bob

JVERSION(s)

    JVERSION
Engine: j903/j64avx2/darwin
Beta-a: commercial/2020-12-17T10:25:30
Library: 9.03.01
Qt IDE: 1.9.2/5.12.10(5.12.10)
Platform: Darwin 64
Installer: J903 install
InstallPath: /users/bobtherriault/j903
Contact: www.jsoftware.com

    JVERSION
Engine: j902/j64avx2/darwin
Release-a: commercial/2020-12-05T12:43:38
Library: 9.02.08
Qt IDE: 1.9.1/5.12.10(5.12.10)
Platform: Darwin 64
Installer: J902 install
InstallPath: /users/bobtherriault/j902
Contact: www.jsoftware.com
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Re: [Jprogramming] [Jchat] J by point and click Lab

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