new to malloc conversion

[bitshifter420]

I can allocate a multi-subscripted array using the new operator like this,
but how do i write it using the malloc function instead.

float (*ptr)[3] = NULL;
int size = 64;

void create(void)
{
   ptr = new float [size][3];
}

void destroy(void)
{
   if(ptr)
   {
      delete [] ptr;
      ptr = NULL;
   }
}