#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;
  double **x;
  
  x = (double **) malloc(rows * sizeof(double));
  for (i = 0; i < rows; i++) {
    x[i] = (double *) malloc(cols * sizeof(double));
  }
  return x;
}

void destroy_matrix(double **x, int rows) {
  int i;

  for (i = 0; i < rows; i++) {
    free(x[i]);
  }
  free(x);
}

void print_matrix(double **x, int rows, int cols) {
  int i, j;
  for (i = 0; i < rows; i++) {
    for (j = 0; j < cols; j++) {
      printf("%f\t", x[i][j]);
    }
    printf("\n");
  }
  fflush(stdout);
}