Write bidimensional array into a binary file - arrays

Question

EDITED
I am trying to write a bidimensional array into a binary file (cop_bin), and I should use fwrite function in the //SAVE ARRAY INTO A BINARY FILE part.
I have used fwrite but it's not working.
As for now I have this code that works perfectly to save data from csv to the array, but now I need to save the array into the binary file.
So far, the code is:
#include<stdio.h>
int muestraMenu ();
void opcion0 (int matriz[699][13]);
int main ()
{
int opcion = 8;
int matriz[699][13];
do
{
opcion = muestraMenu ();
switch (opcion)
{
case 0:
printf (" 0. Configuración e inicialización");
opcion0 (matriz);
break;
case 8:
break;
}
}
while (opcion != 8);
return 0;
}
void opcion0 (int matriz[699][13])
{
int datos[13];
// int matriz[699][13];
int i;
int a[100];
int x = 0;
char line[100];
FILE *f = fopen ("bcancer.csv", "r");
FILE *cop_bin;
if (f == NULL)
{
printf ("error abriendo el fichero bcancer.csv\n");
return;
}
printf ("\n");
//Recorremos fichero para guardar datos en un array bidimensional
while (fgets (line, sizeof line, f))
{
if (sscanf (line, "%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d",
&datos[0], &datos[1], &datos[2], &datos[3], &datos[4],
&datos[5], &datos[6], &datos[7], &datos[8], &datos[9],
&datos[10], &datos[11], &datos[12]) == 13)
{
for (i = 0; i < 13; i++)
{
matriz[x][i] = datos[i];
}
x++;
//datos guardados correctamente
}
else
{
printf ("Datos no válidos");
}
//SAVE ARRAY INTO A BINARY FILE
fwrite(matriz,sizeof(double),1,cop_bin);
fclose(cop_bin);
}
Could you give me a little help?
Thanks a lot.