Simplified structure

src/apatite.cr

@@ -1,6 +1,5 @@
-require "./apatite/core_ext/array"
+require "./apatite/core_ext/*"
-
+require "./apatite/*"
-require "./apatite/linear_algebra"
 
 # Apatite is a fundimental package for scientific computing in Crystal. If that
 # sounds like a modified version of the first line from the NumPy homepage,
@@ -8,6 +7,5 @@ require "./apatite/linear_algebra"
 # of NumPy sitting atop the blazing speed and beautiful syntax
 # of Crystal.
 module Apatite
-  extend self
+  
-  include Apatite::LinearAlgebra
 end

src/apatite/error.cr

@@ -0,0 +1,7 @@
+module Apatite
+  class Error < Exception; end
+  class ErrDimensionMismatch < Error; end
+  class ZeroVectorError < Error; end
+  class ErrNotRegular < Error; end
+  class ErrOperationNotDefined < Error; end
+end

src/apatite/linear_algebra.cr

@@ -1,28 +0,0 @@
-require "./linear_algebra/error"
-# require "./linear_algebra/ndarray"
-require "./linear_algebra/matrix"
-require "./linear_algebra/vector"
-
-module Apatite
-  module LinearAlgebra
-    extend self
-
-    # Calculates the sigmoid curve for a numeric input.
-    #
-    # `f(x) = 1/(1 + e^-x)`
-    #
-    # See also: [Sigmoid function (WikiWand)](https://www.wikiwand.com/en/Sigmoid_function)
-    def sigmoid(input : Number)
-      num = input.to_f64
-      1 / (1 + Math.exp(-num))
-    end
-
-    # Calculates the derivative sigmoid curve for a numeric input.
-    #
-    # `f'(x) = f(x)(1 - f(x)),`
-    def sigmoid_d(input : Number)
-      num = input.to_f64
-      num * (1 - num)
-    end
-  end
-end

src/apatite/linear_algebra/error.cr

@@ -1,9 +0,0 @@
-module Apatite
-  module LinearAlgebra
-    class Error < Exception; end
-    class ErrDimensionMismatch < Error; end
-    class ZeroVectorError < Error; end
-    class ErrNotRegular < Error; end
-    class ErrOperationNotDefined < Error; end
-  end
-end

src/apatite/matrix.cr

@@ -2,7 +2,7 @@ require "./vector"
 require "./matrix/eigenvalue_decomposition"
 require "./matrix/lup_decomposition"
 
-module Apatite::LinearAlgebra
+module Apatite
   class Matrix(T)
     include Enumerable(Vector)
     include Indexable(Vector)

src/apatite/matrix/eigenvalue_decomposition.cr

@@ -1,4 +1,4 @@
-module Apatite::LinearAlgebra
+module Apatite
   class Matrix(T)
     # Eigenvalues and eigenvectors of a real matrix.
     #

src/apatite/matrix/lup_decomposition.cr

@@ -1,4 +1,4 @@
-module Apatite::LinearAlgebra
+module Apatite
   class Matrix(T)
     # For an m-by-n matrix A with m >= n, the LU decomposition is an m-by-n
     # unit lower triangular matrix L, an n-by-n upper triangular matrix U,

src/apatite/ndarray.cr

@@ -1,4 +1,4 @@
-module Apatite::LinearAlgebra
+module Apatite
   class NDArray
     # include Enumerable(Float64)
     # include Indexable(Float64)

src/apatite/vector.cr

@@ -2,7 +2,7 @@ require "complex"
 require "big"
 require "json"
 
-module Apatite::LinearAlgebra
+module Apatite
   # Represents a mathematical vector, and also constitutes a row or column
   # of a `Matrix`
   class Vector(T)