Implement correct matrix output

* Adds support for seed and compressed matrix

src/SparseTransform/Convert/MatrixMarketWriter.cs

@@ -10,31 +10,34 @@ namespace SparseTransform.Convert
     class MatrixMarketWriter : IWriter
     {
         private bool seed;
-        private DoubleMatrix doubleMatrix;
-        private IntegerMatrix intMatrix;
+        private DoubleMatrix inputMatrix;
 
-        public MatrixMarketWriter(bool seed, DoubleMatrix inputDoubleInput, IntegerMatrix inputIntInput)
+        public MatrixMarketWriter(bool seed, DoubleMatrix inputMatrix)
         {
-            intMatrix = inputIntInput;
-            doubleMatrix = inputDoubleInput;
+            this.inputMatrix = inputMatrix;
             this.seed = seed;
         }
 
 
         public string Write(IGraph graph)
         {
+            IntegerMatrix? seedMatrix = graph.ToSeedMatrix(inputMatrix.RowCount);
             if (seed)
             {
                 // ziemlich wilder ausdruck, wa? Liefert die seed matrix aus einem AdjacencyGraph oder BipartiteGraph. (je nachdem was IGraph ist)
-                IntegerMatrix matrix = graph.ToSeedMatrix(graph is AdjacencyGraph ? ((AdjacencyGraph)graph).GetNodeCount() : ((BipartiteGraph)graph).GetRightNodeCount());
-                if (matrix.RowCount != 0)
+                
+                if (seedMatrix is IntegerMatrix && seedMatrix.RowCount != 0)
                 {
-                    return matrix.ToMatrixMarketString();
+                    return seedMatrix.ToMatrixMarketString();
                 }
                 return "null";
             }
             else
             {
+                if (seedMatrix is IntegerMatrix && inputMatrix is DoubleMatrix && seedMatrix.RowCount != 0)
+                {
+                    return CalculateCompressedMatrix(inputMatrix, seedMatrix).ToMatrixMarketString();
+                }
                 return "null";
             }
         }
@@ -43,9 +46,9 @@ namespace SparseTransform.Convert
         /// todo
         /// </summary>
         /// <exception cref="NotImplementedException"></exception>
-        private void CalculateCompressedMatrix()
+        private DoubleMatrix CalculateCompressedMatrix(DoubleMatrix inputMatrix, IntegerMatrix seedMatrix)
         {
-            throw new NotImplementedException();
+            return inputMatrix.Multiply(seedMatrix);
         }
     }
 }
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