minor changes

image.c

@@ -26,6 +26,10 @@ void read_until_space_or_newline(char * buff, int maxCount, FILE * fptr){
 
 Image * load_pgm_image(char * image_file_string){
     FILE * fptr = fopen(image_file_string, "r");
+    if(!fptr){
+        printf("could not open image file. exit\n");
+        exit(1);
+    }
     Image *image = malloc(sizeof(Image));
     image->label = -1;
 

main.c

@@ -23,7 +23,7 @@ void parsingErrorTrain(){
 
 void parsingErrorDetect(){
     printf("invalid syntax\n");
-    printf("Syntax: c_net predict_demo [path_to_network] [image_file]");
+    printf("Syntax: c_net predict_demo [path_to_network] [image_file]\n");
 }
 
 void predict_demo(int argc, char** arguments){

matrix.c

@@ -216,21 +216,6 @@ Matrix* scale(Matrix* matrix, double value) {
     return result_matrix;
 }
 
-Matrix* addScalar(Matrix* matrix, double value) {
-
-    // create a copy of the original matrix
-    Matrix* result_matrix = matrix_copy(matrix);
-
-    // iterate over all numbers in the matrix and add the scalar value
-    for (int i = 0; i < result_matrix->rows; i++) {
-        for (int j = 0; j < result_matrix->columns; j++) {
-            result_matrix->numbers[i][j] += value;
-        }
-    }
-
-    // return the copy
-    return result_matrix;
-}
 
 Matrix* transpose(Matrix* matrix) {
 
@@ -249,16 +234,6 @@ Matrix* transpose(Matrix* matrix) {
 
 }
 
-double matrix_sum(Matrix* matrix) {
-    double sum = 0;
-    for (int i = 0; i < matrix->rows; i++) {
-        for (int j = 0; j < matrix->columns; j++) {
-            sum += matrix->numbers[i][j];
-        }
-    }
-    return sum;
-}
-
 void matrix_save(Matrix* matrix, char* file_string){
 
     // open the file in append mode

matrix.h

@@ -36,6 +36,4 @@ Matrix* subtract(Matrix* matrix1, Matrix* matrix2);
 Matrix* dot(Matrix* matrix1, Matrix* matrix2);
 Matrix* apply(double (*function)(double), Matrix* matrix);
 Matrix* scale(Matrix* matrix, double value);
-Matrix* addScalar(Matrix* matrix, double value);
 Matrix* transpose(Matrix* matrix);
-double matrix_sum(Matrix* matrix);