/* nag_rand_skip_ahead (g05kjc) Example Program. * * Copyright 2008, Numerical Algorithms Group. * * Mark 9, 2009. */ /* Pre-processor includes */ #include #include #include #include #include int main(void) { /* Integer scalar and array declarations */ Integer exit_status = 0; Integer i, lstate; Integer *state = 0; /* NAG structures */ NagError fail; /* Double scalar and array declarations */ double *x = 0; /* Set the sample size */ Integer nv = 5; /* Set the number of elements to advance the sequence */ Integer n = 50; /* Choose the base generator */ Nag_BaseRNG genid = Nag_Basic; Integer subid = 0; /* Set the seed */ Integer seed[] = { 1762543 }; Integer lseed = 1; /* Initialise the error structure */ INIT_FAIL(fail); printf("nag_rand_skip_ahead (g05kjc) Example Program Results\n\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(nv, double)) || !(state = NAG_ALLOC(lstate, Integer))) { printf("Allocation failure\n"); exit_status = -1; goto END; } /* Initialise 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; } /* Advance the sequence N places*/ nag_rand_skip_ahead(n, state, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_rand_skip_ahead (g05kjc).\n%s\n", fail.message); exit_status = 1; goto END; } /* Generate a NV variates from a uniform distribution*/ nag_rand_basic(nv, state, x, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_rand_basic (g05sac).\n%s\n", fail.message); exit_status = 1; goto END; } /* Display the variates*/ for (i = 0; i < nv; i++) printf("%11.4f\n", x[i]); END: if (x) NAG_FREE(x); if (state) NAG_FREE(state); return exit_status; }