Addition of Vector.linspace

[bvenn]

Fixes #235

Please list the changes introduced in this PR

• add generic Seq.linspace
• add Vector.linspace
• add Array.linspace
• add List.linspace
• add tests

Description

I've added Vector.linspace as discussed in #235.

Note: If no sequence length is defined, numpy uses 50 as default. I thought it would be more intuitive, if the stepsize is set to 1.0 if no length is defined.

[Required] please make sure you checked that

• [x] The project builds without problems on your machine

[Optional]

• [x] Added unit tests regarding the added features

[codecov-commenter]

Codecov Report

Merging #251 (39e31c0) into developer (6bf2e74) will increase coverage by 0.01%. The diff coverage is 44.82%.

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@@              Coverage Diff              @@
##           developer     #251      +/-   ##
=============================================
+ Coverage      45.00%   45.01%   +0.01%     
=============================================
  Files            148      148              
  Lines          14479    14532      +53     
  Branches        1923     1930       +7     
=============================================
+ Hits            6516     6542      +26     
- Misses          7433     7460      +27     
  Partials         530      530              

Impacted Files	Coverage Δ
src/FSharp.Stats/List.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/ML/Unsupervised/DbScan.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/Seq.fs	0.78% <0.00%> (-0.04%)	:arrow_down:
src/FSharp.Stats/Vector.fs	15.07% <0.00%> (-0.31%)	:arrow_down:
tests/FSharp.Stats.Tests/Main.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/Array.fs	3.82% <80.00%> (+2.50%)	:arrow_up:
tests/FSharp.Stats.Tests/Array.fs	100.00% <100.00%> (ø)

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[bvenn]

According to VectorExtension, I moved the types into SeqExtension, ListExtension, and ArrayExtension respectively. Because of AutoOpen tags the usage is not changed, but this should enable duplicates of function/member names if necessary.