LA: F# modules matrix sumRows, sumAbsRows, normRows and same for columns

src/FSharp/LinearAlgebra.Matrix.fs

@@ -319,6 +319,12 @@ module Matrix =
     /// Returns the sum of all elements of a matrix.
     let inline sum (A: #Matrix<'a>) = A |> foldSkipZeros (+) Matrix<'a>.Zero
 
+    let inline sumRows (A: #Matrix<_>) = A.RowSums()
+    let inline sumCols (A: #Matrix<_>) = A.ColumnSums()
+
+    let inline sumAbsRows (A: #Matrix<_>) = A.RowAbsoluteSums()
+    let inline sumAbsCols (A: #Matrix<_>) = A.ColumnAbsoluteSums()
+
     /// Returns the sum of the results generated by applying a position dependent function to each column of the matrix.
     let inline sumColsBy f (A: #Matrix<_>) =
         A.EnumerateColumnsIndexed() |> Seq.map (fun (j,col) -> f j col) |> Seq.reduce (+)
@@ -337,6 +343,9 @@ module Matrix =
     let inline inverse (A: #Matrix<_>) = A.Inverse()
 
     let inline norm (A: #Matrix<_>) = A.L2Norm()
+    let inline normRows (A: #Matrix<_>) = A.RowNorms 2.0
+    let inline normCols (A: #Matrix<_>) = A.ColumnNorms 2.0
+
     let inline rank (A: #Matrix<_>) = A.Rank()
     let inline trace (A: #Matrix<_>) = A.Trace()
     let inline determinant (A: #Matrix<_>) = A.Determinant()