Add functions for pmsim

[cpmech]

No description provided.

[codecov-commenter]

Codecov Report

Merging #67 (70c9fcb) into main (a0f11ab) will increase coverage by 0.01%.
Report is 6 commits behind head on main.
The diff coverage is 98.63%.

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@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   98.39%   98.41%   +0.01%     
==========================================
  Files         102      101       -1     
  Lines       20433    20562     +129     
==========================================
+ Hits        20106    20237     +131     
+ Misses        327      325       -2     

Files	Coverage Δ
russell_sparse/src/enums.rs	100.00% <100.00%> (+5.26%)	⬆️
russell_sparse/src/sparse_matrix.rs	98.36% <100.00%> (+0.49%)	⬆️
russell_sparse/src/csc_matrix.rs	98.96% <94.82%> (-0.39%)	⬇️
russell_sparse/src/csr_matrix.rs	99.19% <94.82%> (-0.38%)	⬇️

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