VSL Summary Statistics VSL_SS_SUM error

Pls let me know why the code bellow shows invalid results(sum) when NR is greater than 1999.

#define NR  2000   // MEAN=1 but invalid SUM !

//#define NR  1999 // MEAN=1 and SUM==1999 of course

#define DIM 4

void Test()

{

    VSLSSTaskPtr task;

    int errcode,dim = DIM, n=NR,x_storage=VSL_SS_MATRIX_STORAGE_COLS;

    double x[NR*DIM],mean[DIM], sum[DIM],W[2];

    W[0]=0; W[1]=0;

    for(int j=0;j<DIM;++j)   {mean[j]=0;sum[j]=0;}

    for(int i=0;i<NR*DIM;++i) x[i]=1;

    errcode = vsldSSNewTask( &task, &dim, &n, &x_storage, (double*)x, 0, 0 );

    errcode = vsldSSEditTask(task,VSL_SS_ED_ACCUM_WEIGHT,W);

    errcode = vsldSSEditTask(task,VSL_SS_ED_MEAN,mean);

    errcode = vsldSSEditTask(task,VSL_SS_ED_SUM,sum);

    errcode = vsldSSCompute( task, VSL_SS_MEAN | VSL_SS_SUM, VSL_SS_METHOD_FAST );

    for(int i=0;i<dim;++i)  printf("M[%d] %g  S[%d] %g\n",i,mean[i],i, sum[i]);

    errcode = vslSSDeleteTask( &task );

}

The result when NR=2000 is:

M[0] 1  S[0] -2.65698e+303

M[1] 1  S[1] -2.65698e+303

M[2] 1  S[2] -2.65698e+303

M[3] 1  S[3] -2.65698e+303

I got this result under

  Windows 8.1

  Intel(R) Math Kernel Library Version 11.1.3 Product Build 20140416 for 32-bit applications