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();
+    }
+}