From eefb9d362edc9c4e246527298f6060360f3ea7bc Mon Sep 17 00:00:00 2001
From: regis37 <regis.tsafack@yahoo.com>
Date: Tue, 18 Nov 2025 17:07:34 +0100
Subject: [PATCH] matrix.c is done and matrix.h too. End of Project

---
 imageInputTests.c    |  2 +-
 matrix.c             | 99 +++++++++++++++++++++++++++++++++++++-------
 matrix.h             | 11 +++++
 matrixTests.c        |  2 +-
 mnistVisualization.c |  2 +-
 neuralNetwork.c      |  2 +-
 neuralNetworkTests.c |  2 +-
 7 files changed, 99 insertions(+), 21 deletions(-)

diff --git a/imageInputTests.c b/imageInputTests.c
index 03240ab..b901dd8 100644
--- a/imageInputTests.c
+++ b/imageInputTests.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include "unity.h"
+#include "C:\Git\Versuch 2\unity\unity.h"
 #include "imageInput.h"
 
 
diff --git a/matrix.c b/matrix.c
index ad00628..d2a9ffe 100644
--- a/matrix.c
+++ b/matrix.c
@@ -1,35 +1,102 @@
-#include <stdlib.h>
-#include <string.h>
 #include "matrix.h"
-
-// TODO Matrix-Funktionen implementieren
+#include <stdlib.h>
 
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
-    
+    if (rows == 0 || cols == 0) {
+        Matrix m = {0, 0, NULL};
+        return m;
+    }
+
+    Matrix m;
+    m.rows = rows;
+    m.cols = cols;
+    m.buffer = (MatrixType*)malloc(rows * cols * sizeof(MatrixType));
+
+    if (!m.buffer) {
+        m.rows = m.cols = 0;
+    }
+
+    return m;
 }
 
 void clearMatrix(Matrix *matrix)
 {
-    
-}
+    if (!matrix || !matrix->buffer)
+        return;
 
-void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
-{
-    
+    free(matrix->buffer);
+    matrix->buffer = NULL;
+    matrix->rows = 0;
+    matrix->cols = 0;
 }
 
 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];
 }
 
-Matrix add(const Matrix matrix1, const Matrix matrix2)
+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;
 }
 
-Matrix multiply(const Matrix matrix1, const Matrix matrix2)
+Matrix add(const Matrix m1, const Matrix m2)
 {
-    
-}
\ No newline at end of file
+    // Broadcasting unterstützt
+    if (m1.rows != m2.rows || (m1.cols != m2.cols && m1.cols != 1 && m2.cols != 1)) {
+        Matrix error = {0, 0, NULL};
+        return error;
+    }
+
+    unsigned int rows = m1.rows;
+    unsigned int cols = (m1.cols > m2.cols) ? m1.cols : m2.cols;
+
+    Matrix result = createMatrix(rows, cols);
+    if (!result.buffer)
+        return result;
+
+    for (unsigned int i = 0; i < rows; i++) {
+        for (unsigned int j = 0; j < cols; j++) {
+
+            MatrixType a = (m1.cols == 1) ? m1.buffer[i] : m1.buffer[i * m1.cols + j];
+            MatrixType b = (m2.cols == 1) ? m2.buffer[i] : m2.buffer[i * m2.cols + j];
+
+            result.buffer[i * cols + j] = a + b;
+        }
+    }
+
+    return result;
+}
+
+Matrix multiply(const Matrix m1, const Matrix m2)
+{
+    if (m1.cols != m2.rows) {
+        Matrix error = {0, 0, NULL};
+        return error;
+    }
+
+    Matrix result = createMatrix(m1.rows, m2.cols);
+    if (!result.buffer)
+        return result;
+
+    for (unsigned int i = 0; i < m1.rows; i++) {
+        for (unsigned int j = 0; j < m2.cols; j++) {
+
+            MatrixType sum = 0;
+
+            for (unsigned int k = 0; k < m1.cols; k++)
+                sum += m1.buffer[i * m1.cols + k] * m2.buffer[k * m2.cols + j];
+
+            result.buffer[i * m2.cols + j] = sum;
+        }
+    }
+
+    return result;
+}
diff --git a/matrix.h b/matrix.h
index cc640d1..5804051 100644
--- a/matrix.h
+++ b/matrix.h
@@ -1,18 +1,29 @@
 #ifndef MATRIX_H
 #define MATRIX_H
 
+
 #define UNDEFINED_MATRIX_VALUE 0
 
 typedef float MatrixType;
 
 // TODO Matrixtyp definieren
 
+typedef struct {
+    unsigned int rows;
+    unsigned int cols;
+    MatrixType *buffer;
+} Matrix;
 
 Matrix createMatrix(unsigned int rows, unsigned int cols);
+
 void clearMatrix(Matrix *matrix);
+
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx);
+
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx);
+
 Matrix add(const Matrix matrix1, const Matrix matrix2);
+
 Matrix multiply(const Matrix matrix1, const Matrix matrix2);
 
 
diff --git a/matrixTests.c b/matrixTests.c
index 80b1daa..bd693ce 100644
--- a/matrixTests.c
+++ b/matrixTests.c
@@ -2,7 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "matrix.h"
-#include "unity.h"
+#include "C:\Git\Versuch 2\unity\unity.h"
 
 
 void test_createMatrixFailsOnZeroDimensions(void)
diff --git a/mnistVisualization.c b/mnistVisualization.c
index b0a29f5..c957bde 100644
--- a/mnistVisualization.c
+++ b/mnistVisualization.c
@@ -2,7 +2,7 @@
 #include <stdio.h>
 #include <string.h>
 #include "mnistVisualization.h"
-#include "raylib.h"
+#include "C:\Git\Versuch 2\raylib\raylib.h"
 
 #define MAX_TEXT_LEN 100
 
diff --git a/neuralNetwork.c b/neuralNetwork.c
index bd8f164..30e6e4f 100644
--- a/neuralNetwork.c
+++ b/neuralNetwork.c
@@ -170,7 +170,7 @@ NeuralNetwork loadModel(const char *path)
 
 static Matrix imageBatchToMatrixOfImageVectors(const GrayScaleImage images[], unsigned int count)
 {
-    Matrix matrix = {NULL, 0, 0};
+    Matrix matrix = {0, 0, NULL};
 
     if(count > 0 && images != NULL)
     {
diff --git a/neuralNetworkTests.c b/neuralNetworkTests.c
index 21ab370..e73bf21 100644
--- a/neuralNetworkTests.c
+++ b/neuralNetworkTests.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
-#include "unity.h"
+#include "C:\Git\Versuch 2\unity\unity.h"
 #include "neuralNetwork.h"