Skip to content
Marc & Structures
Index

Course account

Save your progress

Enter your email and we will send a secure sign-in link. There is no password and the first link creates your account.

Debugging ~6 min · ~24 min remaining

Diagnose loads and constraints

Identify empty selections, incorrect distributions, and confused reference systems.

Bug hunting

Run 05_bug_hunt.mac. It does not contain a solver failure; it contains five logically incorrect implementations.

  1. fixed_nodes is created after all nodes are restored.
  2. The fixed support ends up applied to the entire model.
  3. NSEL,R tries to find the tip within a selection that no longer contains it.
  4. Full force is applied to each tip node.
  5. CSYS, DSYS, and RSYS are used as if they rotated the nodal system.
Quick check

A nodal selection for loading is empty. What is the safe response?

Professional incident

Incident M05: diagnose before editing

The solved total load differs from the declared resultant.

Execution cycle

  1. 1 Run the broken script in a clean folder.
  2. 2 Preserve the original .out.
  3. 3 Write one causal hypothesis and make one change.
  4. 4 Compare evidence before and after.
Evidence to retain

Graduated hints

1 · Concept hint

Find the first broken contract.

2 · Command hint

Inspect state related to NSEL, *GET, F, and FSUM.

3 · Explained solution

Compare with the module deliverable and explain why the corrected state restores the contract.

Your reflection stays in this browser.

View complete module Download m05-kit.zip