Added single array matrix

utils/utils.c

@@ -1,6 +1,30 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+/*
+ * Create a matrix stored in a single array.
+ */
+double *create_sa_matrix(int rows, int cols) {
+  double *x;
+
+  x = (double *) malloc(rows * cols * sizeof(double));
+  return x;
+}
+
+/*
+ * Destroy a single array matrix.
+ */
+void destroy_sa_matrix(double *x) {
+  free(x);
+}
+
+/*
+ * Get the index for the single array matrix
+ * that correspond to the given row and column.
+ */
+int sa_index(int cols, int r, int c) {
+  return r * cols + c;
+}
 
 double **create_matrix(int rows, int cols) {
   int i;

utils/utils.h

@@ -16,7 +16,12 @@ typedef struct borders {
   double west;
 } borders;
 
+
+double *create_sa_matrix(int rows, int cols);
+void destroy_sa_matrix(double *x);
+int sa_index(int cols, int r, int c);
+
 double **create_matrix(int rows, int cols);
+void destroy_matrix(double **x, int rows);
 
 void print_matrix(double **x, int rows, int cols);
-void destroy_matrix(double **x, int rows);