matrix.c aktualisiert

matrix.c

@@ -1,35 +1,92 @@
-#include <stdlib.h>
-#include <string.h>
 #include "matrix.h"
+#include <stdlib.h>
 
-// TODO Matrix-Funktionen implementieren
+// Matrix erstellen
-
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
+    Matrix m;
+    if (rows == 0 || cols == 0) {
+        m.rows = 0;
+        m.cols = 0;
+        m.buffer = NULL;
+        return m;
+    }
 
+    m.rows = rows;
+    m.cols = cols;
+    m.buffer = (MatrixType*)calloc(rows * cols, sizeof(MatrixType));
+    if (!m.buffer) {
+        m.rows = 0;
+        m.cols = 0;
+    }
+    return m;
 }
 
+// Speicher freigeben
 void clearMatrix(Matrix *matrix)
 {
-    
+    if (!matrix || !matrix->buffer) return;
+    free(matrix->buffer);
+    matrix->buffer = NULL;
+    matrix->rows = 0;
+    matrix->cols = 0;
 }
 
+// Wert setzen
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if (rowIdx >= matrix.rows || colIdx >= matrix.cols) return;
+    matrix.buffer[rowIdx * matrix.cols + colIdx] = value;
 }
 
+// Wert auslesen
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if (rowIdx >= matrix.rows || colIdx >= matrix.cols) return UNDEFINED_MATRIX_VALUE;
+    return matrix.buffer[rowIdx * matrix.cols + colIdx];
 }
 
+// Addition
 Matrix add(const Matrix matrix1, const Matrix matrix2)
 {
+    Matrix result;
+    if (matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols) {
+        result.rows = 0;
+        result.cols = 0;
+        result.buffer = NULL;
+        return result;
+    }
 
+    result = createMatrix(matrix1.rows, matrix1.cols);
+    for (unsigned int i = 0; i < matrix1.rows * matrix1.cols; i++)
+        result.buffer[i] = matrix1.buffer[i] + matrix2.buffer[i];
+
+    return result;
 }
 
+// Multiplikation
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
+    Matrix result;
+    if (matrix1.cols != matrix2.rows) {
+        result.rows = 0;
+        result.cols = 0;
+        result.buffer = NULL;
+        return result;
+    }
 
+    result = createMatrix(matrix1.rows, matrix2.cols);
+
+    for (unsigned int i = 0; i < matrix1.rows; i++)
+    {
+        for (unsigned int j = 0; j < matrix2.cols; j++)
+        {
+            MatrixType sum = 0;
+            for (unsigned int k = 0; k < matrix1.cols; k++)
+                sum += matrix1.buffer[i * matrix1.cols + k] * matrix2.buffer[k * matrix2.cols + j];
+            result.buffer[i * result.cols + j] = sum;
+        }
+    }
+
+    return result;
 }