[SF#1856] Link empty ravels causes link selected handles to malfunction

[highperformancecoder]

Migrated from SourceForge ticket #1856

Original Reporter: profstevekeen
Created: 2025-02-01 14:14:36.594000
Last Modified: 2026-09-22 00:08:10.531000
Status: open

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Description

These Ravels are linked but the caliper on the 3rd ravel doesn't change when the other two do.

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Attachments

• CaliperMalfunction20240201.rvl

[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-02-01 22:48:48.359000

It's not just the calipers - the 3rd ravel doesn't update when the others do, nor affect the other two, as though it were unlinked. Furthermore, adding more ravels to the linked group doesn't add linked ravels.

It's some weird thing to do with this example, if I create a fresh canvas with 3 linked ravels, then it works properly.

[highperformancecoder]

Comment by profstevekeen (SourceForge)
Date: 2025-02-01 23:48:26.474000

Thought so! A Heisenbug?

[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-02-06 04:11:23.706000

I doubt it. It seems perfectly reproducible.

[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-02-06 06:08:29.918000

• status: open --> wont-fix
• assigned_to: High Performance Coder

[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-02-06 06:08:30.255000

Eventually tracked down the issue. You didn't have that Ravel's handles linked in the "Link specific handles" form. Not sure how you got into that state unintentionally... But nothing to see here.

[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-02-06 06:10:11.106000

Attached snapshot showing the unlinked ravel handles.

[highperformancecoder]

Comment by profstevekeen (SourceForge)
Date: 2025-02-06 06:42:35.485000

There may be something to see because the way I added the 3rd Ravel (from
memory) was by "add to linked group".
Best, Steve
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On Thu, Feb 6, 2025 at 7:10 AM High Performance Coder <
hpcoder@users.sourceforge.net> wrote:

Attached snapshot showing the unlinked ravel handles.

Attachments:

• link-specific-handles.png
  https://sourceforge.net/p/minsky/ravel/_discuss/thread/7f4b10e897/c3eb/attachment/link-specific-handles.png
  (19.0 kB; image/png)

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[ravel:#669] https://sourceforge.net/p/minsky/ravel/669/ Caliper
Malfunction

Status: wont-fix
Milestone: Babbage
Created: Sat Feb 01, 2025 02:14 PM UTC by Steve Keen
Last Updated: Thu Feb 06, 2025 06:08 AM UTC
Owner: High Performance Coder
Attachments:

• CaliperMalfunction20240201.png
  https://sourceforge.net/p/minsky/ravel/669/attachment/CaliperMalfunction20240201.png
  (263.1 kB; image/png)
• CaliperMalfunction20240201.rvl
  https://sourceforge.net/p/minsky/ravel/669/attachment/CaliperMalfunction20240201.rvl
  (1.2 MB; application/octet-stream)

These Ravels are linked but the caliper on the 3rd ravel doesn't change
when the other two do.

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[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-02-07 02:08:02.210000

• summary: Caliper Malfunction --> Link empty ravels causes link selected handles to malfunction
• status: wont-fix --> open

[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-02-07 02:15:04.602000

Fair enough. It seems that adding an empty ravel to a link group causes this situation, even if "Link selected handles" is not accessed. Even including an empty ravel

We need some ground rules, which would inform a unit test:

1. If Link selected handles has never been selected, then all handles should match
2. When a ravel's hypercube is changed, then maximum matching of handles within the "link selected handles block" should be performed.

OTOH the workaround is to select all ravels once their inputs are defined, unlink them then relink them, which resets all the handles being matched.

[highperformancecoder]

Comment by hpcoder (SourceForge)
Date: 2025-03-02 23:14:44.221000

• Milestone: Babbage --> Backlog