diff -r 000000000000 -r e01b65623f72 benchmarks/matrix-multiplication/src/main/java/org/apidesign/benchmark/matrixmul/Matrix.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/benchmarks/matrix-multiplication/src/main/java/org/apidesign/benchmark/matrixmul/Matrix.java	Wed Dec 05 11:18:09 2012 +0100
@@ -0,0 +1,64 @@
+package org.apidesign.benchmark.matrixmul;
+
+//import java.io.PrintStream;
+//import java.util.Random;
+
+public class Matrix {
+
+    private final int rank;
+    private float data[][];
+    
+    public Matrix(int r) {
+        rank = r;
+        data = new float[r][r];
+    }
+    
+    public void setElement(int i, int j, float value) {
+        data[i][j] = value;
+    }
+    public float getElement(int i, int j) {
+        return data[i][j];
+    }
+    
+    public void generateData() {
+        //final Random rand = new Random();
+        //final int x = 10;
+        for (int i = 0; i < rank; i++) {
+            for (int j = 0; j < rank; j++) {
+                data[i][j] = i + j;
+            }
+        }
+    }
+
+    public Matrix multiply(Matrix m) {
+        if (rank != m.rank) {
+            throw new IllegalArgumentException("Rank doesn't match");
+        }
+        
+        final float res[][] = new float[rank][rank];
+        for (int i = 0; i < rank; i++) {
+            for (int j = 0; j < rank; j++) {
+                float ij = 0;
+                for (int q = 0; q < rank; q++) {
+                    ij += data[i][q] * m.data[q][j];
+                }
+                res[i][j] = ij;
+            }
+        }
+        data = res;
+        
+        return this;
+    }
+    
+    /*
+    public void printOn(PrintStream s) {
+        for (int i = 0; i < rank; i++) {
+            for (int j = 0; j < rank; j++) {
+                s.printf("%f ", data[i][j]);
+            }
+            s.println();
+        }
+    }
+    */
+    
+}