Impl ordinary diff equation solver

[cpmech]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.83115% with 74 lines in your changes are missing coverage. Please review.

Project coverage is 98.59%. Comparing base (39608cb) to head (7750622).
Report is 12 commits behind head on main.

Files	Patch %	Lines
russell_sparse/src/complex_solver_mumps.rs	94.76%	22 Missing ⚠️
russell_sparse/src/complex_solver_umfpack.rs	95.82%	15 Missing ⚠️
russell_ode/src/explicit_runge_kutta.rs	97.47%	13 Missing ⚠️
russell_ode/src/radau5.rs	98.79%	8 Missing ⚠️
russell_lab/src/matrix/complex_mat_inverse.rs	98.34%	6 Missing ⚠️
russell_ode/src/ode_solver.rs	98.84%	4 Missing ⚠️
russell_ode/src/euler_backward.rs	99.02%	2 Missing ⚠️
russell_ode/src/euler_forward.rs	97.53%	2 Missing ⚠️
russell_ode/src/system.rs	99.39%	1 Missing ⚠️
russell_sparse/src/complex_lin_solver.rs	97.56%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   98.44%   98.59%   +0.14%     
==========================================
  Files         102      131      +29     
  Lines       20905    26842    +5937     
==========================================
+ Hits        20580    26464    +5884     
- Misses        325      378      +53     

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