#include "matlab.h"
#include "getdata_external.h"
#include <math.h>

extern double readdata(void);

mxArray * Mgetdata(int nargout_)
{ 
   return( mlfScalar( readdata() )); 
}
double readdata(void)
{
   static double t = 0.0;
   t = t + 0.05;
   return sin(t);
}