'small' fix

Makefile

@@ -21,7 +21,7 @@ sequential:
 
 parallel:
 	@mkdir -p $(BIN_FOLDER)
-	$(NVCC) $(SRC_FOLDER)/$(PARALLEL_FOLDER)/$(SRC-CUDA) $(SRC_FOLDER)/parser.c $(SRC_FOLDER)/$(PARALLEL_FOLDER)/parallel.cu
+	$(NVCC) $(SRC_FOLDER)/$(PARALLEL_FOLDER)/$(SRC-CUDA) $(SRC_FOLDER)/$(PARALLEL_FOLDER)/parallel.cu
 	@mv a.out $(BIN_FOLDER)/$(NN-CUDA)
 
 clean:

include/parser.h

@@ -6,7 +6,75 @@
 #include <time.h>
 
 
-void read_matrix(int **row_ptr, int **col_ind, float **values, const char *filename, int *num_rows, int *num_cols, int *num_vals);
+void read_matrix(int **row_ptr, int **col_ind, float **values, const char *filename, int *num_rows, int *num_cols, int *num_vals){
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        fprintf(stdout, "File cannot be opened!\n");
+        exit(0);
+    }
+
+    // Get number of rows, columns, and non-zero values
+    fscanf(file, "%d %d %d\n", num_rows, num_cols, num_vals);
+
+    int *row_ptr_t = (int *) malloc((*num_rows + 1) * sizeof(int));
+    int *col_ind_t = (int *) malloc(*num_vals * sizeof(int));
+    float *values_t = (float *) malloc(*num_vals * sizeof(float));
+
+    // Collect occurances of each row for determining the indices of row_ptr
+    int *row_occurances = (int *) malloc(*num_rows * sizeof(int));
+    for (int i = 0; i < *num_rows; i++) {
+        row_occurances[i] = 0;
+    }
+
+    int row, column;
+    float value;
+    while (fscanf(file, "%d %d %f\n", &row, &column, &value) != EOF) {
+        // Subtract 1 from row and column indices to match C format
+        row--;
+        column--;
+
+        row_occurances[row]++;
+    }
+
+    // Set row_ptr
+    int index = 0;
+    for (int i = 0; i < *num_rows; i++) {
+        row_ptr_t[i] = index;
+        index += row_occurances[i];
+    }
+    row_ptr_t[*num_rows] = *num_vals;
+    free(row_occurances);
+
+    // Set the file position to the beginning of the file
+    rewind(file);
+
+    // Read the file again, save column indices and values
+    for (int i = 0; i < *num_vals; i++) {
+        col_ind_t[i] = -1;
+    }
+
+    fscanf(file, "%d %d %d\n", num_rows, num_cols, num_vals);
+    int i = 0;
+    while (fscanf(file, "%d %d %f\n", &row, &column, &value) != EOF) {
+        row--;
+        column--;
+
+        // Find the correct index (i + row_ptr_t[row]) using both row information and an index i
+        while (col_ind_t[i + row_ptr_t[row]] != -1) {
+            i++;
+        }
+        col_ind_t[i + row_ptr_t[row]] = column;
+        values_t[i + row_ptr_t[row]] = value;
+        i = 0;
+    }
+
+    fclose(file);
+
+    *row_ptr = row_ptr_t;
+    *col_ind = col_ind_t;
+    *values = values_t;
+}
+
 
 #endif // PARSER_H