/* nag_rngs_sample (g05nbc) Example Program. * * Copyright 2001 Numerical Algorithms Group. * * Mark 7, 2001. */ #include #include #include #include #include int main(int argc, char *argv[]) { FILE *fpout; /* Scalars */ Integer i, igen, k, m, n; Integer exit_status = 0; NagError fail; /* Arrays */ Integer *ipop = 0, *isampl = 0; Integer iseed[4]; INIT_FAIL(fail); /* Check for command-line IO options */ fpout = nag_example_file_io(argc, argv, "-results", NULL); fprintf(fpout, "nag_rngs_sample (g05nbc) Example Program Results\n\n"); n = 8; /* Allocate memory */ if (!(ipop = NAG_ALLOC(n, Integer)) || !(isampl = NAG_ALLOC(n, Integer))) { fprintf(fpout, "Allocation failure\n"); exit_status = -1; goto END; } /* Initialise the seed to a repeatable sequence */ iseed[0] = 1762543; iseed[1] = 9324783; iseed[2] = 1542344; iseed[3] = 742355; /* igen identifies the stream. */ igen = 1; /* nag_rngs_init_repeatable (g05kbc). * Initialize seeds of a given generator for random number * generating functions (that pass seeds explicitly) to give * a repeatable sequence */ nag_rngs_init_repeatable(&igen, iseed); fprintf(fpout, " Samples from the first %1ld integers\n", n); fprintf(fpout, "\n"); fprintf(fpout, " Sample size Values\n"); for (i = 0; i < n; ++i) ipop[i] = i+1; for (m = 1; m <= n; ++m) { /* nag_rngs_sample (g05nbc). * Pseudo-random sample from an integer vector */ nag_rngs_sample(ipop, n, isampl, m, igen, iseed, &fail); if (fail.code != NE_NOERROR) { fprintf(fpout, "Error from nag_rngs_sample (g05nbc).\n%s\n", fail.message); exit_status = 1; goto END; } fprintf(fpout, "%6ld ", m); for (k = 0; k < m; ++k) { fprintf(fpout, "%3ld%s", isampl[k], (k+1)%8 == 0 || k == m-1?"\n":" "); } } END: if (fpout != stdout) fclose(fpout); if (ipop) NAG_FREE(ipop); if (isampl) NAG_FREE(isampl); return exit_status; }