From 4da0a796c1eb01a20d027a3e63d624b15759bfad Mon Sep 17 00:00:00 2001
From: = <markus.kob@outlook.com>
Date: Thu, 20 Nov 2025 16:25:20 +0100
Subject: [PATCH] Added matrix funcionality methods

---
 matrix.c | 40 ++++++++++++++++++++++++++++++----------
 1 file changed, 30 insertions(+), 10 deletions(-)

diff --git a/matrix.c b/matrix.c
index ec22def..41f1d40 100644
--- a/matrix.c
+++ b/matrix.c
@@ -72,17 +72,27 @@ Matrix createMatrix(size_t rows, size_t cols)
 
 void clearMatrix(Matrix *matrix)
 {
+    for (int i = 0; i < matrix->rows; i++) {
+        for (int j = 0; j < matrix->cols;j++) {
+            matrix->buffer[i-1 + matrix->rows*(j-1)] = UNDEFINED_MATRIX_VALUE;
+        }
+    }
+    free(matrix->buffer);
+    matrix->rows = 0;
+    matrix->cols = 0;
     
 }
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    matrix.buffer[rowIdx-1 + matrix.rows*(colIdx-1)] = value;
 }
 
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    MatrixType returnVal;
+    returnVal = matrix.buffer[rowIdx-1 + matrix.rows*(colIdx-1)];
+    return returnVal;
 }
 
 Matrix add(const Matrix matrix1, const Matrix matrix2)
@@ -93,13 +103,18 @@ Matrix add(const Matrix matrix1, const Matrix matrix2)
         Matrix outputMatrix = createMatrix(matrix1.rows, matrix1.cols);
         for (int i = 0; i < matrix1.rows;i++) {
             for (int j = 0; j < matrix1.cols; j++) {
-                // I dont exactly know how the input for the matrix is set, so this is only the explanation on how to do the math
-                // outputMatrix.buffer[i][j] = matrix1.buffer[i][j] + matrix2.buffer[i][j];
+                // how this should work in normal Matrix version:
+                // outputmatrix.buffer[i][j] = matrix1.buffer[i][j] + matrix2.buffer[i][j];
+                outputMatrix.buffer[i-1+ outputMatrix.rows*(j-1)] = matrix1.buffer[i-1 + matrix1.rows*(j-1)] + matrix2.buffer[i-1 + matrix2.rows *(j-1)];
             }
         }
     } else {
-        //no matrix could be added, consequence should be defined
-        // return NULL;
+        //the matrix could not be added, since the matrix sizes are not set correct.
+        Matrix m;
+        m.rows = 0; 
+        m.cols = 0;
+        m.buffer = NULL;
+        return m;
     }
 
 }
@@ -112,14 +127,19 @@ Matrix multiply(const Matrix matrix1, const Matrix matrix2)
         for(int i = 0; i < matrix1.rows; i++) {
             for (int j = 0; j < matrix2.cols; j++) {
                 for (int k = 0; k < matrix2.rows; k++) {
-                    // I dont exactly know how the input for the matrix is set, so this is only the explanation on how to do the math
-                    // outputMatrix.buffer[i][j] = matrix1.buffer[i][k] * matrix2[k][j];
+                    // how this should work in normal Matrix version:
+                    // outputMatrix.buffer[i][j] = matrix1.buffer[i][k] * matrix2.buffer[k][j];
+                    outputMatrix.buffer[i-1 + outputMatrix.rows*(j-1)] = matrix1.buffer[i-1 + matrix1.rows*(k-1)] * matrix2.buffer[k-1 + matrix2.rows*(j-1)];
                 }
             }
         }
         return outputMatrix;
     } else {
-        //no matrix could be added, consequence should be defined
-        // return NULL;
+        //the matrix could not be added, since the matrix sizes are not set correct.
+        Matrix m;
+        m.rows = 0; 
+        m.cols = 0;
+        m.buffer = NULL;
+        return m;
     }
 }
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