Update design_graphfcns.py

[barneydobson]

Description

A little efficiency gain - something was being recalculated in a loop that needn't be

Fixes # (issue)

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass (eg. python -m pytest)
• The documentation builds and looks OK (eg. python -m sphinx -b html docs docs/build)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future. (Indicate issue here: # (issue))

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.54%. Comparing base (a6fd02f) to head (5d83e07).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #354   +/-   ##
=======================================
  Coverage   87.54%   87.54%           
=======================================
  Files          22       22           
  Lines        2224     2224           
  Branches      282      282           
=======================================
  Hits         1947     1947           
  Misses        198      198           
  Partials       79       79           

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[dalonsoa]

Little things matter! 👍