1. Make RealMatrixImpl implement Serializable

2. Make all currently unimplemented methods throw UnsupportedOperationException
3. Add solve() method to RealMatrix interface, representing vector
   solution to AX = B, where B is the parameter and A is *this.

Phil

Obtained from: Phil S.
Submitted by: Phil S.
Reviewed by: Tim O.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@140826 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/math/Freq.java

@@ -100,7 +100,7 @@ public class Freq {
     }
 
     public String toXML() {
-        return null;
+        throw new UnsupportedOperationException("not implemented yet");
     }
 
     /** Adds 1 to the frequency count for v */

src/java/org/apache/commons/math/RealMatrix.java

@@ -57,7 +57,7 @@ package org.apache.commons.math;
 /**
  * Interface defining a real-valued matrix with basic algebraic operations
  * @author  Phil Steitz
- * @version $Revision: 1.1 $ $Date: 2003/05/12 19:03:41 $
+ * @version $Revision: 1.2 $ $Date: 2003/05/13 19:08:14 $
  */
 public interface RealMatrix {
 
@@ -221,6 +221,16 @@ public interface RealMatrix {
      * @return v*this
      * @throws IllegalArgumentException if rowDimension != v.size()
      */
-    public RealMatrix preMultiply(double[] v);    
+    public RealMatrix preMultiply(double[] v);  
+    
+    /**
+     * Returns the solution vector for a linear system with coefficient
+     * matrix = *this and constant vector = b 
+     * @param b  constant vector
+     * @return   vector of solution values to AX = b, where A is *this
+     * @throws   IllegalArgumentException if rowDimension != b.length or matrix 
+     *           is singular
+     */
+    public double[] solve(double[] b);
 }
 

src/java/org/apache/commons/math/RealMatrixImpl.java

@@ -53,14 +53,16 @@
  */
 
 package org.apache.commons.math;
+import java.io.Serializable;
 
 /**
  * Implementation for RealMatrix using double[][] array
  * @author  Phil Stetiz
- * @version $Revision: 1.1 $ $Date: 2003/05/12 19:04:10 $
+ * @version $Revision: 1.2 $ $Date: 2003/05/13 19:08:14 $
  */
-public class RealMatrixImpl implements RealMatrix {
+public class RealMatrixImpl implements RealMatrix, Serializable {
 
+    /** Entries of the matrix */
     private double data[][];
     
     public RealMatrixImpl() {
@@ -86,7 +88,7 @@ public class RealMatrixImpl implements RealMatrix {
      * @return  the cloned matrix
      */
     public RealMatrix copy() {
-        return null;
+        throw new UnsupportedOperationException("not implemented yet");
     }
     
     /**
@@ -374,4 +376,16 @@ public class RealMatrixImpl implements RealMatrix {
         throw new UnsupportedOperationException("not implemented yet");
     }
     
+    /**
+     * Returns the solution vector for a linear system with coefficient
+     * matrix = *this and constant vector = b 
+     * @param b  constant vector
+     * @return   vector of solution values to AX = b, where A is *this
+     * @throws   IllegalArgumentException if rowDimension != b.length or matrix 
+     *           is singular
+     */
+    public double[] solve(double[] b) {
+      throw new UnsupportedOperationException("not implemented yet");
+    } 
+    
 }