Impl vec diff and scaling

[cpmech]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.39%. Comparing base (3636957) to head (2a93666).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   99.37%   99.39%   +0.01%     
==========================================
  Files         196      209      +13     
  Lines       42319    43259     +940     
==========================================
+ Hits        42056    42996     +940     
  Misses        263      263              

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