Minsky / Bugs / #1856 Link empty ravels causes link selected handles to malfunction

High Performance Coder - 2025-02-01

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.

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- Steve Keen - 2025-02-01
  
  Thought so! A Heisenbug?
  
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  - High Performance Coder - 2025-02-06
    
    I doubt it. It seems perfectly reproducible.
    
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High Performance Coder - 2025-02-06

status: open --> wont-fix

assigned_to: High Performance Coder
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High Performance Coder - 2025-02-06

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.

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High Performance Coder - 2025-02-06

Attached snapshot showing the unlinked ravel handles.

link-specific-handles.png

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- Steve Keen - 2025-02-06
  
  There may be something to see because the way I added the 3rd Ravel (from
  memory) was by "add to linked group".
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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)
  
  [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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High Performance Coder - 2025-02-07

summary: Caliper Malfunction --> Link empty ravels causes link selected handles to malfunction

status: wont-fix --> open
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High Performance Coder - 2025-02-07

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.

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High Performance Coder - 2025-03-02

Milestone: Babbage --> Backlog
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High Performance Coder - 2025-06-25

Ticket moved from /p/minsky/ravel/669/

Can't be converted:

_priority: 3ReallyUrgent
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High Performance Coder - 2025-06-25

labels: --> ravel

priority: 3ReallyUrgent --> 4normal
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Link empty ravels causes link selected handles to malfunction

System dynamics program with additional features for economics

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#1856 Link empty ravels causes link selected handles to malfunction

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