A-M baby

Task/Multiple-regression/Ruby/multiple-regression-1.rb

@@ -0,0 +1,8 @@
+require 'matrix'
+
+def regression_coefficients y, x
+  y = Matrix.column_vector y.map { |i| i.to_f }
+  x = Matrix.columns x.map { |xi| xi.map { |i| i.to_f }}
+
+  (x.t * x).inverse * x.t * y
+end

Task/Multiple-regression/Ruby/multiple-regression-2.rb

@@ -0,0 +1 @@
+puts regression_coefficients([1, 2, 3, 4, 5], [ [2, 1, 3, 4, 5] ])