From bf7355b3c525001d4bbf223998c69cc44dc92226 Mon Sep 17 00:00:00 2001
From: maxgrf <r9ky2wmtjf@privaterelay.appleid.com>
Date: Sat, 15 Nov 2025 03:42:28 +0100
Subject: [PATCH] matrix function written

---
 matrix.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 71 insertions(+), 6 deletions(-)

diff --git a/matrix.c b/matrix.c
index 3f8fad6..7509636 100644
--- a/matrix.c
+++ b/matrix.c
@@ -6,32 +6,97 @@
 
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
-    
+
+    Matrix m = {NULL, rows, cols} //Wahrscheinlich in Programm bereits enthalten;
+
+    if (rows > 0 && cols > 0)
+    {
+        m.buffer = (MatrixType *)calloc(rows * cols, sizeof(MatrixType));
+        if (m.buffer == NULL)
+        {
+            m.rows = 0;
+            m.cols = 0;
+        }
+    }
+
+    return m;
 }
 
+
 void clearMatrix(Matrix *matrix)
 {
-    
+
+    if (matrix != NULL)
+    {
+        free(matrix->buffer);
+        matrix->buffer = NULL;
+        matrix->rows = 0;
+        matrix->cols = 0;
+    }
 }
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
+    //not testet
 {
-    
+    if (rowIdx < matrix.rows && colIdx < matrix.cols && matrix.buffer != NULL)
+        matrix.buffer[rowIdx * matrix.cols + colIdx] = value;
 }
 
+    
+
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if (rowIdx >= matrix.rows || colIdx >= matrix.cols || matrix.buffer == NULL)
+        return 0; // Sicherheitscheck
+    return matrix.buffer[rowIdx * matrix.cols + colIdx];
 }
 
 //TODO: Funktionen implementieren
 
 Matrix add(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    //Needed: rows/Zeilen, collums/Spalten
+
+    //test, if two matrix has exact size
+
+    if(matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
+        return -1;
+
+
+    for(int r = 0; r < matrix1.rows; r++)
+    {
+        for(int c = 0; c < matrix1.cols; c++)
+        {
+            //TODO: matrix_add initialisieren
+            matrix_add[r][c] = matrix1[r][c] + matrix2[r][c]
+        }
+    }
 }
 
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    //Needed: rows/Zeilen, collums/Spalten
+    int buffer_add = 0; //TODO: Datentyp achten, ist int richitg?
+    Matrix result = {NULL, 0, 0} //Leere Matrix, falls fehler
+    //Probe ob Spalten1 = Zeilen2
+    if(matrix1.cols != matrix2.rows)
+        return -1;
+
+    result = createMatrix(matrix1.rows, matrix2.rows); // ""
+
+    for(int index = 0; index < matrix1.rows; index++)
+    {
+        for(int shift = 0; shift < matrix2.cols; shift++)
+        {
+            for(int skalar = 0; skalar<matrix1.cols; skalar++)
+            //TODO: matrix_add initialisieren
+            {
+                //buffer_add += matrix1[index][skalar]*matrix2[skalar][index];
+                buffer_add += getMatrixAt(matrix1, index, skalar) + getMatrixAt(matrix2, skalar, shift);
+            }
+            //matrix_mul[index][shift] = buffer_add;
+            setMatrixAt(buffer_add,result,index,shift);
+        }
+    buffer_add = 0;
+    }
 }
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