#include <stdio.h>
#include <stdlib.h>

/* #define ENABLE_LOG */

#ifdef ENABLE_LOG
#  define LOG(x) x
#else
#  define LOG(x) (void) 0 
#endif

/*
 * Macro used with single array matrices to
 * get the array index given the number of columns,
 * the row index and the column index.
 */
#define IDX(cols, r, c) ((r) * (cols) + (c))

typedef struct borders {
  double north;
  double east;
  double south;
  double west;
} borders;


/*
 * Create a matrix stored in a single array.
 */
double *create_sa_matrix(int rows, int cols);

/*
 * Destroy a single array matrix.
 */
void destroy_sa_matrix(double *x);

int sa_index(int cols, int r, int c);

/*
 * Print a single array matrix.
 */
void print_sa_matrix(double *x, int rows, int cols);

double **create_matrix(int rows, int cols);
void destroy_matrix(double **x, int rows);
void print_matrix(double **x, int rows, int cols);