/* nag_runs_test (g08eac) Example Program.
*
* Copyright 2017 Numerical Algorithms Group.
*
* Mark 26.1, 2017.
*
*/
#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagg05.h>
#include <nagg08.h>
int main(void)
{
/* Integer scalar and array declarations */
Integer exit_status = 0;
Integer nruns, lstate;
Integer *state = 0;
/* NAG structures */
NagError fail;
/* Double scalar and array declarations */
double chi, df, p, *x = 0;
/* Choose the base generator */
Nag_BaseRNG genid = Nag_Basic;
Integer subid = 0;
/* Set the seed */
Integer seed[] = { 324213 };
Integer lseed = 1;
/* Set the size of the (randomly generated) dataset */
Integer n = 10000;
/* Set the the length of the longest run */
Integer max_run = 6;
/* Initialize the error structure */
INIT_FAIL(fail);
printf("nag_runs_test (g08eac) Example Program Results\n");
/* Get the length of the state array */
lstate = -1;
nag_rand_init_repeatable(genid, subid, seed, lseed, state, &lstate, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_rand_init_repeatable (g05kfc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}
/* Allocate arrays */
if (!(x = NAG_ALLOC(n, double)) || !(state = NAG_ALLOC(lstate, Integer)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
/* Initialize the generator to a repeatable sequence */
nag_rand_init_repeatable(genid, subid, seed, lseed, state, &lstate, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_rand_init_repeatable (g05kfc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}
/* Generate vector of n uniform variates between 0.0 and 1.0 */
nag_rand_uniform(n, 0.0, 1.0, state, x, &fail);
/* nag_runs_test (g08eac).
* Performs the runs up or runs down test for randomness
*/
nag_runs_test(n, x, max_run, &nruns, &chi, &df, &p, &fail);
/* Display the results */
if (fail.code == NE_NOERROR || fail.code == NE_G08EA_RUNS) {
printf("\n");
printf("Total number of runs found = %10" NAG_IFMT "\n", nruns);
if (fail.code == NE_G08EA_RUNS)
printf("** Note : the number of runs requested were not found.\n");
printf("\n");
printf("Chisq = %10.4f\n", chi);
printf("DF = %8.2f\n", df);
printf("Prob = %10.4f\n", p);
}
else {
printf("Error from nag_runs_test (g08eac).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
END:
NAG_FREE(x);
NAG_FREE(state);
return exit_status;
}