From 1c5cd42acca8d1589e3ca2f15c8bee7ebd2014c1 Mon Sep 17 00:00:00 2001
From: jw <jannik.wild@siemens.com>
Date: Thu, 20 Nov 2025 15:13:55 +0100
Subject: [PATCH] matrix programmiert

---
 matrix.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++------
 matrix.h |  6 ++++-
 2 files changed, 75 insertions(+), 9 deletions(-)

diff --git a/matrix.c b/matrix.c
index ad00628..aeaa979 100644
--- a/matrix.c
+++ b/matrix.c
@@ -2,34 +2,96 @@
 #include <string.h>
 #include "matrix.h"
 
-// TODO Matrix-Funktionen implementieren
-
+// Matrix erstellen
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
-    
+    Matrix matrix = {NULL, 0, 0};
+    if (rows == 0 || cols == 0) {
+        return matrix; // Keine Speicherallokation
+    }
+    matrix.buffer = (MatrixType *)calloc(rows * cols, sizeof(MatrixType));
+    matrix.rows = rows;
+    matrix.cols = cols;
+    return matrix;
 }
 
+// Speicher freigeben
 void clearMatrix(Matrix *matrix)
 {
-    
+    if (matrix->buffer != NULL) {
+        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 && matrix.buffer != NULL) {
+        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 && matrix.buffer != NULL) {
+        return matrix.buffer[rowIdx * matrix.cols + colIdx];
+    }
+    return UNDEFINED_MATRIX_VALUE; // Fehlerbehandlung
 }
 
+// Matrizen addieren (mit Broadcasting)
 Matrix add(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    if (matrix1.buffer == NULL || matrix2.buffer == NULL) {
+        return (Matrix){NULL, 0, 0};
+    }
+
+    // Prüfen auf Broadcasting-Kompatibilität
+    if (!((matrix1.rows == matrix2.rows) || (matrix1.rows == 1) || (matrix2.rows == 1))) {
+        return (Matrix){NULL, 0, 0};
+    }
+    if (!((matrix1.cols == matrix2.cols) || (matrix1.cols == 1) || (matrix2.cols == 1))) {
+        return (Matrix){NULL, 0, 0};
+    }
+
+    unsigned int resultRows = (matrix1.rows > matrix2.rows) ? matrix1.rows : matrix2.rows;
+    unsigned int resultCols = (matrix1.cols > matrix2.cols) ? matrix1.cols : matrix2.cols;
+
+    Matrix result = createMatrix(resultRows, resultCols);
+
+    for (unsigned int i = 0; i < resultRows; i++) {
+        for (unsigned int j = 0; j < resultCols; j++) {
+            MatrixType val1 = matrix1.buffer[(matrix1.rows == 1 ? 0 : i) * matrix1.cols +
+                                             (matrix1.cols == 1 ? 0 : j)];
+            MatrixType val2 = matrix2.buffer[(matrix2.rows == 1 ? 0 : i) * matrix2.cols +
+                                             (matrix2.cols == 1 ? 0 : j)];
+            result.buffer[i * resultCols + j] = val1 + val2;
+        }
+    }
+
+    return result;
 }
 
+// Matrizen multiplizieren
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    if (matrix1.cols != matrix2.rows || matrix1.buffer == NULL || matrix2.buffer == NULL) {
+        return (Matrix){NULL, 0, 0};
+    }
+
+    Matrix 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;
 }
\ No newline at end of file
diff --git a/matrix.h b/matrix.h
index cc640d1..3623fe3 100644
--- a/matrix.h
+++ b/matrix.h
@@ -6,7 +6,11 @@
 typedef float MatrixType;
 
 // TODO Matrixtyp definieren
-
+typedef struct {
+    MatrixType *buffer;    // zuerst der Speicherbereich
+    unsigned int rows;     // dann die Anzahl Zeilen
+    unsigned int cols;     // dann die Anzahl Spalten
+} Matrix;
 
 Matrix createMatrix(unsigned int rows, unsigned int cols);
 void clearMatrix(Matrix *matrix);