Use in-place operations for Matrix generators

[dlfivefifty]

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[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.65%. Comparing base (51240f0) to head (9b2acf0).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/NumericalRepresentationTheory.jl	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   79.32%   79.65%   +0.32%     
==========================================
  Files           3        3              
  Lines         387      403      +16     
==========================================
+ Hits          307      321      +14     
- Misses         80       82       +2     

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