anchor.diff:          let flattenColWise (matrix: Matrix<'a>) =
               matrix.Transpose |> flattenRowWise
           
  -    end
   
       module MG = Generic
       module DS = DoubleImpl
  
positive.code: 
          loop (nCols-1-indices.Length) (indices.Length-1) (nCols-1)
  
  end
  
  [<AutoOpen>]
  module MatrixExtension =
  
negative.code:     |Sample
      |Population
  
      module Generic = 
  
          module MS = SpecializedGenericImpl
  
  