YAPC::EU 2018 Glasgow Update!

Task/QR-decomposition/Java/qr-decomposition.java

@@ -0,0 +1,25 @@
+import Jama.Matrix;
+import Jama.QRDecomposition;
+
+import java.io.StringWriter;
+import java.io.PrintWriter;
+
+public class Decompose {
+    public static void main(String[] args) {
+        Matrix matrix = new Matrix(new double[][] {
+            { 12, -51,   4 },
+            {  6, 167, -68 },
+            { -4,  24, -41 },
+        });
+
+        QRDecomposition d = new QRDecomposition(matrix);
+        System.out.print(toString(d.getQ()));
+        System.out.print(toString(d.getR()));
+    }
+
+    public static String toString(Matrix m) {
+        StringWriter sw = new StringWriter();
+        m.print(new PrintWriter(sw, true), 8, 6);
+        return sw.toString();
+    }
+}

Task/QR-decomposition/SAS/qr-decomposition.sas

@@ -28,5 +28,4 @@ quit;
           -14       -21        14
             0      -175        70
             0         0        35
-
 */

Task/QR-decomposition/Scala/qr-decomposition.scala

@@ -0,0 +1,22 @@
+import java.io.{PrintWriter, StringWriter}
+
+import Jama.{Matrix, QRDecomposition}
+
+object QRDecomposition extends App {
+  val matrix =
+    new Matrix(
+      Array[Array[Double]](Array(12, -51, 4),
+        Array(6, 167, -68),
+        Array(-4, 24, -41)))
+  val d = new QRDecomposition(matrix)
+
+  def toString(m: Matrix): String = {
+    val sw = new StringWriter
+    m.print(new PrintWriter(sw, true), 8, 6)
+    sw.toString
+  }
+
+  print(toString(d.getQ))
+  print(toString(d.getR))
+
+}