real pickdist(real eta, real sigma)
{
static real eta0 = -1.0, sigcorr;
int niter;
real x, y, q;
if (eta != eta0) {
sigcorr =
rsqrt(8 * eta /
(bessel_K(0.75, 1/(32*eta)) / bessel_K(0.25, 1/(32*eta)) - 1));
eprintf("[%s: sigma correction factor = %f]\n", getargv0(), sigcorr);
eta0 = eta;
}
niter = 0;
do {
x = xrandom(-1.0, 1.0);
y = xrandom(0.0, YMAX);
q = rexp(- 0.5 * rsqr(fmap(x)) - eta * rsqr(rsqr(fmap(x)))) *
(1 + x*x) / rsqr(1 - x*x);
if (q > YMAX) /* should not ever happen */
error("%s: guess out of bounds\n x = %f q = %f > %f\n",
getargv0(), x, q, YMAX);
niter++;
if (niter > 1000)
error("%s: 1000 iterations without success\n", getargv0());
} while (y > q || x*x == 1); /* 2nd test prevents infty */
return (sigcorr * sigma * fmap(x));
}
real vnpick(real (*fun)(real), real xmin, real xmax, real fmax, string name)
{
int ncyc;
bool warn;
real fr, fx, x;
ncyc = 0;
warn = FALSE;
fr = 1.0;
fx = 0.0;
while (fr > fx) {
x = xrandom(xmin, xmax);
fx = (*fun)(x);
fr = xrandom(0.0, 1.1 * fmax);
if (fx > 1.01 * fmax && ! warn) {
eprintf("[%s.vnpick: %s(%g) = %g > %s_max = %g]\n",
getprog(), name, x, fx, name, fmax);
warn = TRUE;
}
if (fx > 1.1 * fmax)
error("%s.vnpick: %s(x) out of bounds\n", getprog(), name);
ncyc++;
if (ncyc % NCYC == 0)
eprintf("[%s.vnpick: %d cycles picking %s(x)]\n",getprog(), ncyc, name);
}
return (x);
}
/* Read data. */
static int
random_pread (void *handle, void *buf, uint32_t count, uint64_t offset,
uint32_t flags)
{
uint32_t i;
unsigned char *b = buf;
uint64_t s;
for (i = 0; i < count; ++i) {
/* We use nbdkit common/include/random.h to make random numbers.
*
* However we're not quite using it in the ordinary way. In order
* to be able to read any byte of data without needing to run the
* PRNG from the start, the random data is computed from the index
* and seed through three rounds of PRNG:
*
* index i PRNG(seed+i) -> PRNG -> PRNG -> mod 256 -> b[i]
* index i+1 PRNG(seed+i+1) -> PRNG -> PRNG -> mod 256 -> b[i+1]
* etc
*/
struct random_state state;
xsrandom (seed + offset + i, &state);
xrandom (&state);
xrandom (&state);
s = xrandom (&state);
s &= 255;
b[i] = s;
}
return 0;
}
local void testdata(void) {
real rsc, vsc, r, v, x, y;
bodyptr p;
float scale = 1.0f;
float vscale = 1.0f;
float mscale = 1.0f;
if (nbody < 1) // check for silly values
error("%s: absurd value for nbody\n", getargv0());
bodytab = (bodyptr) allocate(nbody * sizeof(body));
// alloc space for bodies
rsc = (3 * PI) / 16; // set length scale factor
vsc = rsqrt(1.0 / rsc); // find speed scale factor
for (p = bodytab; p < bodytab+nbody; p++) { // loop over particles
Type(p) = BODY; // tag as a body
//Mass(p) = 1.0 / nbody; // set masses equal
// Set mass randomly, like in brute
Mass(p) = (rand() / (float) RAND_MAX) * mscale;
x = xrandom(0.0, MFRAC); // pick enclosed mass
r = 1.0 / rsqrt(rpow(x, -2.0/3.0) - 1); // find enclosing radius
pickshell(Pos(p), NDIM, rsc * r); // pick position vector
do { // select from fn g(x)
x = xrandom(0.0, 1.0); // for x in range 0:1
y = xrandom(0.0, 0.1); // max of g(x) is 0.092
} while (y > x*x * rpow(1 - x*x, 3.5)); // using von Neumann tech
v = x * rsqrt(2.0 / rsqrt(1 + r*r)); // find resulting speed
pickshell(Vel(p), NDIM, vsc * v); // pick velocity vector
}
tnow = 0.0; // set elapsed model time
}
nemo_main()
{
int n=getiparam("n");
int iter=getiparam("iter");
int m=getiparam("m");
int seed = init_xrandom(getparam("seed"));
int i,j,k,l;
real *x, sum;
real t0,t1,t2;
init_timers(100);
stamp_timers(0);
x = (real *) allocate(n*sizeof(real));
for (i=0; i<n; i++) /* init the whole array */
x[i] = xrandom(0.0,1.0);
for (i=0; i<m; i++) /* cache it in again ? */
x[i] = xrandom(0.0,1.0);
sum = 0.0;
t0 = cputime();
stamp_timers(1);
if (m==0) { /* do it in one sweep, the N^2 algorithm */
stamp_timers(2);
for (l=0; l<iter; l++)
for (j=0; j<n; j++)
for (i=0; i<n; i++)
sum += FUN(x[i],x[j]);
stamp_timers(3);
} else { /* N/M times a small M*M patch that may be in cache */
stamp_timers(2);
for (l=0; l<iter; l++)
for (k=0; k<n-m; k++)
for (j=k; j<k+m; j++)
for (i=k; i<k+m; i++)
sum += FUN(x[i],x[j]);
stamp_timers(3);
}
stamp_timers(4);
t1 = cputime();
if (m)
printf("%d %d %d sum=%lg Mops=%lg\n",
n,iter,m,sum,iter*m*m*n/(t1-t0)/60.0/1e6);
else
printf("%d %d %d sum=%lg Mops=%lg\n",
n,iter,m,sum,iter*n*n/(t1-t0)/60.0/1e6);
stamp_timers(5);
printf("%Ld %Ld %Ld %Ld %Ld\n",
diff_timers(0,1),
diff_timers(1,2),
diff_timers(2,3),
diff_timers(3,4),
diff_timers(4,5));
}
/* The "+=" operator combines two samples. If you have two empty samples "a" and "b", then
call push() several times on each, then say "a += b", then that is equivalent to having
push()ed all the values into "a" originally. */
reservoir_sample_t &operator+=(const reservoir_sample_t &s) {
/* If each element of the incoming sample literally represents one object, then we can
just use push(). */
if (s.n < goal) {
for (int i = 0; i < s.n; i++) push(s.samples[i]);
/* If each element of us just represents one object, we reduce it to the above case by
switching the operands. */
} else if (n < goal) {
reservoir_sample_t temp(*this);
*this = s;
*this += temp;
/* Both samples are full, so we "zipper" them, choosing randomly between the two samples
at each point with the appropriate probability. */
} else {
assert(n >= goal && s.n >= goal);
for (int i = 0; i < goal; i++) {
if (xrandom(0, n + s.n - 1) < s.n) {
samples[i] = s.samples[i];
}
}
n += s.n;
}
}
void polymodel(void)
{
gsl_interp_accel *pmsplacc = gsl_interp_accel_alloc();
bodyptr p;
real rad, phi, vel, psi, vr, vp, a, E, J;
vector rhat, vtmp, vper;
for (p = btab; p < NthBody(btab, nbody); p = NextBody(p)) {
rad = rad_m(xrandom(0.0, mtot));
phi = gsl_spline_eval(pmspline, (double) rad, pmsplacc);
vel = pick_v(phi);
psi = pick_psi();
vr = vel * rcos(psi);
vp = vel * rsin(psi);
Mass(p) = mtot / nbody;
pickshell(rhat, NDIM, 1.0);
MULVS(Pos(p), rhat, rad);
pickshell(vtmp, NDIM, 1.0);
a = dotvp(vtmp, rhat);
MULVS(vper, rhat, - a);
ADDV(vper, vper, vtmp);
a = absv(vper);
MULVS(vper, vper, vp / a);
MULVS(Vel(p), rhat, vr);
ADDV(Vel(p), Vel(p), vper);
Phi(p) = phi;
E = phi + 0.5 * rsqr(vel);
J = rad * ABS(vp);
Aux(p) = Kprime * rpow(phi1 - E, npol - 1.5) * rpow(J, 2 * mpol);
}
gsl_interp_accel_free(pmsplacc);
}
void gspsphere(void)
{
real gamma0, mcut, r, sig2, eint = 0.0;
static real *sig2tab = NULL;
bodyptr bp;
nbody = getiparam("nbody");
assert(nbody > 0);
gamma0 = getdparam("gamma");
mcut = getdparam("mcut");
assert(0.0 < mcut && mcut <= 1.0);
if (sig2tab == NULL)
sig2tab = calc_sig2_gsp(gsp, ggsp, 0.0);
if (btab == NULL)
btab = (bodyptr) allocate(nbody * SizeofBody);
for (bp = btab; bp < NthBody(btab, nbody); bp = NextBody(bp)) {
Mass(bp) = gsp->mtot / nbody;
r = r_mass_gsp(gsp, xrandom(0.0, mcut * gsp->mtot));
pickshell(Pos(bp), NDIM, r);
CLRV(Vel(bp));
Rho(bp) = rho_gsp(gsp, r);
sig2 = sig2_gsp(gsp, ggsp, 0.0, sig2tab, r);
EntFunc(bp) = sig2 / rpow(Rho(bp), gamma0 - 1);
Uintern(bp) = sig2 / (gamma0 - 1);
eint += Mass(bp) * Uintern(bp);
}
eprintf("[%s: thermal energy = %f]\n", getargv0(), eint);
}
void makedisk(bool randspin)
{
int i;
bodyptr bp;
double m, r, v, phi;
matrix xmat, zmat;
vector tmpv;
for (i = 0; i < ndisk; i++) { // loop initializing bodies
bp = NthBody(disk, i); // set ptr to body number i
m = mdtab[NTAB-1] * ((double) i + 0.5) / ndisk;
r = gsl_interp_eval(rm_spline, mdtab, rdtab, m, NULL);
v = gsl_interp_eval(vr_spline, rdtab, vctab, r, NULL);
phi = xrandom(0.0, 2 * M_PI);
Pos(bp)[0] = r * sin(phi);
Pos(bp)[1] = r * cos(phi);
Pos(bp)[2] = 0.0;
Vel(bp)[0] = v * cos(phi);
Vel(bp)[1] = - v * sin(phi);
Vel(bp)[2] = 0.0;
pickshell(AuxVec(bp), NDIM, 1.0);
if (randspin) {
xmatrix(xmat, acos(AuxVec(bp)[2]));
zmatrix(zmat, atan2(AuxVec(bp)[0], AuxVec(bp)[1]));
MULMV(tmpv, xmat, Pos(bp));
MULMV(Pos(bp), zmat, tmpv);
MULMV(tmpv, xmat, Vel(bp));
MULMV(Vel(bp), zmat, tmpv);
}
}
}
void polymodel1(void)
{
bodyptr p;
real r, x, v;
for (p = btab; p < NthBody(btab, nbody); p = NextBody(p)) {
Mass(p) = 1.0 / nbody;
r = xrandom(0.0, 2.0);
pickshell(Pos(p), 3, r);
x = SQRT2 * rcos(PI * (2.0 - xrandom(0.0, 1.0)) / 4.0);
v = (xrandom(-1.0, 1.0) < 0.0 ? -1.0 : 1.0) *
(1 - x*x) * rsqrt(rlog(2 / r));
MULVS(Vel(p), Pos(p), v/r);
Phi(p) = 0.5 * rlog(r / 2.0) - 0.5;
}
bodyfields[4] = NULL; // don't output Aux data
}
void makedisk(void)
{
real m, r, phi, vcir, omega, Adisk, kappa, sigma1, sigma2,
mu_eff, sig_r, sig_p, sig_z, vrad, vorb2, vorb, vphi;
double Trr = 0.0, Tpp = 0.0, Tzz = 0.0;
int i;
bodyptr dp;
for (i = 0; i < ndisk; i++) { /* loop initializing bodies */
m = mdtab[NTAB-1] * ((real) i + 0.5) / ndisk;
r = seval(m, &mdtab[0], &rdtab[0], &rdtab[NTAB], NTAB);
vcir = seval(r, &rdtab[0], &vctab[0], &vctab[NTAB], NTAB);
omega = vcir / r;
Adisk = (omega - spldif(r, &rdtab[0], &vctab[0], &vctab[NTAB], NTAB)) / 2;
if (omega - Adisk < 0.0)
error("%s: kappa undefined (omega - Adisk < 0)\n"
" r, omega, Adisk = %f %f %f\n", getargv0(), r, omega, Adisk);
kappa = 2 * rsqrt(rsqr(omega) - Adisk * omega);
sigma1 = rsqr(alpha1) * mdisk1 * rexp(- alpha1 * r) / TWO_PI;
sigma2 = rsqr(alpha2) * mdisk2 * rexp(- alpha2 * r) / TWO_PI;
mu_eff = (r_mu>0 ? 1 + (mu - 1) * (r / (r + r_mu)) : mu);
sig_z = rsqrt(PI * (sigma1 + sigma2) * zdisk);
sig_r = mu_eff * sig_z;
sig_p = (0.5 * kappa / omega) * sig_r;
vorb2 = rsqr(vcir) + rsqr(sig_r) * (1 - 2 * alpha1 * r) - rsqr(sig_p) +
(r_mu>0 ? rsqr(sig_z) * r * mu_eff*(2*mu-2)*r_mu/rsqr(r+r_mu) : 0);
vorb = rsqrt(MAX(vorb2, 0.0));
dp = NthBody(disk, i); /* set up ptr to disk body */
Mass(dp) = mdisk1 / ndisk;
phi = xrandom(0.0, TWO_PI);
Pos(dp)[0] = r * rsin(phi);
Pos(dp)[1] = r * rcos(phi);
Pos(dp)[2] = zdisk * ratanh(xrandom(-1.0, 1.0));
vrad = (eta > 0 ? pickdist(eta, sig_r) : grandom(0.0, sig_r));
vphi = (eta > 0 ? pickdist(eta, sig_p) : grandom(0.0, sig_p)) + vorb;
Vel(dp)[0] = vrad * rsin(phi) + vphi * rcos(phi);
Vel(dp)[1] = vrad * rcos(phi) - vphi * rsin(phi);
Vel(dp)[2] = grandom(0.0, sig_z);
Trr += Mass(dp) * rsqr(sig_r) / 2;
Tpp += Mass(dp) * (rsqr(vorb) + rsqr(sig_p)) / 2;
Tzz += Mass(dp) * rsqr(sig_z) / 2;
}
eprintf("[%s: Trr = %f Tpp = %f Tzz = %f]\n", getargv0(), Trr, Tpp, Tzz);
}
void pickvec(vector x, bool cf)
{
dprintf(1,"pickvec: cf = %d\t", cf);
if (cf) /* cent. concentrated? */
pickshell(x, NDIM, xrandom(0.0, 1.0)); /* pick from M(r) = r */
else
pickball(x, NDIM, 1.0); /* use uniform distr. */
dprintf(1,"x = [%8.4f,%8.4f,%8.4f]\n", x[0], x[1], x[2]);
}
int choose_seeds(seed_t *seeds, int nseeds) {
nseeds = std::min(nseeds, parent->size);
/* Choose consecutive seeds to avoid duplicates. */
int start = xrandom(rnd, 0, parent->size - 1);
for (int i = 0; i < nseeds; i++) {
seeds[i] = start++;
if (start == parent->size) start = 0;
}
return nseeds;
}
testdisk(int n)
{
Body *dp;
real rmin2, rmax2, r_i, theta_i, mass_i, rring;
real cost, sint;
int i, ndim=NDIM;
double pos_d[NDIM], vel_d[NDIM], pot_d, time_d = 0.0;
double tani = tan(pitch*PI/180.0);
if (disk == NULL) disk = (Body *) allocate(ndisk * sizeof(Body));
rmin2 = rmin * rmin;
rmax2 = rmax * rmax;
rring = 0.5*(rmin+rmax);
mass_i = 1.0 / (real)ndisk;
for (dp=disk, i = 0; i < ndisk; dp++, i++) {
Mass(dp) = mass_i;
if (Qkey) Key(dp) = key;
r_i = sqrt(rmin2 + xrandom(0.0,1.0) * (rmax2 - rmin2));
if (Qtest)
theta_i = 0.0;
else if (Quniform)
theta_i = xrandom(0.0,TWO_PI);
else
theta_i = frandom(0.0,360.0,density) * PI / 180.0;
theta_i += offset;
if (Qlinear) {
theta_i -= SPk * (r_i-rref) * TWO_PI; /* linear spiral arm */
} else {
theta_i -= log(r_i/rref)/tani; /* logaarithmic spiral arm */
}
cost = cos(theta_i);
sint = sin(theta_i);
Phase(dp)[0][0] = pos_d[0] = r_i * cost; /* set positions */
Phase(dp)[0][1] = pos_d[1] = r_i * sint;
Phase(dp)[0][2] = pos_d[2] = 0.0;
(*potential)(&ndim,pos_d,vel_d,&pot_d,&time_d); /* get flow */
Phase(dp)[1][0] = vel_d[0] * jz_sign;
Phase(dp)[1][1] = vel_d[1] * jz_sign;
Phase(dp)[1][2] = 0.0;
}
}
real pick_psi(void)
{
static real hmax = -1.0;
real x, psi;
if (hmax < 0.0)
hmax = (mpol > 0 ? rpow(2.0, mpol) : 1);
x = vnpick(hfunc, 0.0, 1.0, hmax, "hfunc");
psi = racos(1 - rpow(x, 1 / (mpol + 1)));
return (xrandom(-1.0, 1.0) < 0.0 ? PI - psi : psi);
}
char *make_nonce() {
char *nonce = malloc(NONCE_SIZE);
int rnd;
memset(nonce, 0, NONCE_SIZE);
rnd = xrandom();
pthread_mutex_lock(&rng_lock);
random_r(&rng_state, &rnd);
pthread_mutex_unlock(&rng_lock);
snprintf((char *) nonce, NONCE_SIZE - 1, "%d", rnd);
return nonce;
}
void gspmodel(void)
{
real beta_a, mcut, vcut, vfac;
static real *sig2 = NULL;
real r, vmax2, sigr, sig, x, y, vr, v1, v2;
bodyptr bp;
vector rhat, vec1, vec2, vtmp;
beta_a = getdparam("beta_a");
assert(beta_a <= 1.0);
nbody = getiparam("nbody");
assert(nbody > 0);
mcut = getdparam("mcut");
assert(0.0 < mcut && mcut <= 1.0);
vcut = getdparam("vcut");
assert(vcut > 0.0);
if (sig2 == NULL)
sig2 = calc_sig2_gsp(gsp, ggsp, beta_a);
if (btab == NULL)
btab = (bodyptr) allocate(nbody * SizeofBody);
vfac = rsqrt(1 - beta_a);
for (bp = btab; bp < NthBody(btab, nbody); bp = NextBody(bp)) {
Mass(bp) = gsp->mtot / nbody;
r = r_mass_gsp(gsp, xrandom(0.0, mcut * gsp->mtot));
vmax2 = -2 * rsqr(vcut) * phi_gsp(ggsp, r);
if (vfac > 1.0)
vmax2 = vmax2 / rsqr(vfac);
sigr = rsqrt(sig2_gsp(gsp, ggsp, beta_a, sig2, r));
sig = fixsigma(sigr, rsqrt(vmax2));
do {
vr = grandom(0.0, sig);
v1 = grandom(0.0, sig);
v2 = grandom(0.0, sig);
} while (vr*vr + v1*v1 + v2*v2 > vmax2);
picktriad(rhat, vec1, vec2);
MULVS(Pos(bp), rhat, r);
MULVS(Vel(bp), rhat, vr);
MULVS(vtmp, vec1, v1 * vfac);
ADDV(Vel(bp), Vel(bp), vtmp);
MULVS(vtmp, vec2, v2 * vfac);
ADDV(Vel(bp), Vel(bp), vtmp);
Phi(bp) = phi_gsp(ggsp, r);
Aux(bp) = Phi(bp) + 0.5 * dotvp(Vel(bp), Vel(bp));
}
if (getbparam("besort"))
qsort(btab, nbody, SizeofBody, berank);
if (getbparam("zerocm"))
snapcenter(btab, nbody, MassField.offset);
if (! strnull(getparam("auxvar")))
setauxvar(btab, nbody);
}
int
main ()
{
std::srand (static_cast<unsigned>(std::time (0) ^ getpid ()));
Cache<int, int> int_cache (10000);
for (size_t i = 0; i != int_cache.get_capacity (); ++i)
{
int_cache.insert (xrandom (1000000), xrandom (1000000));
}
Cache<int, int> const & cache_ref = int_cache;
for (size_t i = 0; i != cache_ref.get_capacity () * 100; ++i)
{
cache_ref.get (xrandom (1000000), &value);
}
std::cout << "last value: " << value << std::endl;
std::pair<unsigned long, unsigned long> stats = cache_ref.get_stats ();
std::cout << "hits: " << stats.first << " / misses: " << stats.second
<< std::endl;
}
/* push() puts a new object into the sample. */
void push(sample_t s) {
/* We have room to store the object directly */
if (n < goal) {
samples[n] = s;
/* We don't have room; we may have to kick something out */
} else {
int slot = xrandom(0, n);
if (slot < goal) samples[slot] = s;
}
n++;
}
Z32
roll_dice2(DiceRep dice)
{
Z16u die = 0, i = 0;
Z16 numdice = 0, offset = 0;
Z32 rslt = 0;
dice2(dice, numdice, die, offset);
if (!numdice)
return offset;
rslt = offset;
for (i = 0; i < numdice; ++i)
rslt += (1 + xrandom(die));
return rslt;
}
void plummodel(real mfrac)
{
real rsc, vsc, r, v, x, y;
bodyptr p;
if (mfrac < 0 || mfrac > 1) // check for silly values
error("%s: absurd value for mfrac\n", getprog());
rsc = (3 * PI) / 16; // set length scale factor
vsc = rsqrt(1.0 / rsc); // and speed scale factor
for (p = btab; p < NthBody(btab,nbody); p = NextBody(p)) {
// loop over particles
Mass(p) = 1.0 / nbody; // set masses equal
x = xrandom(0.0, mfrac); // pick enclosed mass
r = 1.0 / rsqrt(rpow(x, -2.0/3.0) - 1); // find enclosing radius
pickshell(Pos(p), NDIM, rsc * r); // pick position vector
do { // use von Neumann rejection
x = xrandom(0.0, 1.0); // for x in range 0:1
y = xrandom(0.0, 0.1); // max of g(x) is 0.092
} while (y > x*x * rpow(1 - x*x, 3.5)); // select from g(x)
v = x * rsqrt(2.0 / rsqrt(1 + r*r)); // find resulting speed
pickshell(Vel(p), NDIM, vsc * v); // pick velocity vector
Phi(p) = -1.0 / (rsc * rsqrt(rsqr(r) + 1)); // compute model potential
}
}
int bestx(int b, int loops){
int bestx = 0, bestxt = 0;
int x, xt, i, j;
for(x=0; x<256; x++){
xt = 0;
for(i=0; i<loops; i++){
for(j=0; j<16; j++){
in[j] = xrandom() >> 16;
}
in[b] = x;
xt += aescycles(); xt += aescycles(); xt += aescycles();
xt += aescycles(); xt += aescycles();
}
if(xt>bestxt){
bestx = x, bestxt = xt;
}
}
return bestx;
}
void bernstein(char *seed){
int loops, b, j, k;
mrandom(strlen(seed), seed);
for(loops=4; loops<=65536; loops*=16){
for(b=0; b<16; b++){
printf("%.2d, %.5d loops:", b, loops);
for(k=0; k<10; k++){
for(j=0; j<16; j++){
key[j] = xrandom() >> 16;
}
ExpandKey(key, expkey);
printf(" %.2x", bestx(b, loops) ^ key[b]);
fflush(stdout);
}
printf("\n");
}
}
}
/*
* mrandom:
*
* Initialize the random number generator based on the given seed.
*
*/
void mrandom(int len, char *ptr){
unsigned short rand = *ptr;
int idx, bit = len * 4;
memset(RandTbl, 0, sizeof(RandTbl));
RandHead = 0;
while(rand *= 20077, rand += 11, bit--){
if(ptr[bit>>2] & (1<<(bit & 3))){
for(idx = 0; idx<5; idx++){
rand *= 20077, rand += 11;
RandTbl[rand % 96 << 2] ^= 1;
}
}
}
for(idx=0; idx<96*63; idx++){
xrandom ();
}
}
void testdisk(void)
{
int ndisk, i;
real rmin2, rmax2, eps2, sigma, r_i, theta_i, m_i, v_i;
bodyptr gp, sp;
ndisk = getiparam("ndisk");
ngalaxy = ndisk + (getbparam("nosphr") ? 0 : nspheroid);
galaxy = (bodyptr) allocate(ngalaxy * SizeofBody);
rmin2 = rsqr(getdparam("rmin"));
rmax2 = rsqr(getdparam("rmax"));
eps2 = rsqr(getdparam("eps"));
sigma = getdparam("sigma");
init_random(getiparam("seed"));
for (i = 0; i < ndisk; i++) { /* build disk */
gp = NthBody(galaxy, i);
Mass(gp) = 0.0; /* set mass to zero */
r_i = rsqrt(rmin2 + i * (rmax2 - rmin2) / (ndisk - 1.0));
theta_i = xrandom(0.0, TWO_PI);
Pos(gp)[0] = r_i * rsin(theta_i); /* set positions */
Pos(gp)[1] = r_i * rcos(theta_i);
Pos(gp)[2] = 0.0;
if (r_i < rsph[NTAB-1])
m_i = seval(r_i, &rsph[0], &msph[0], &msph[NTAB], NTAB);
else
m_i = msph[NTAB-1];
v_i = rsqrt(MAX(m_i, 0.0) * r_i*r_i / rpow(r_i*r_i + eps2, 1.5));
/* set velocities */
Vel(gp)[0] = grandom( v_i * rcos(theta_i), sigma);
Vel(gp)[1] = grandom(- v_i * rsin(theta_i), sigma);
Vel(gp)[2] = grandom( 0.0, sigma);
}
if (! getbparam("nosphr"))
for (i = 0; i < nspheroid; i++) { /* append spheroid */
sp = NthBody(spheroid, i);
gp = NthBody(galaxy, ndisk + i);
memcpy(gp, sp, SizeofBody);
}
if (getbparam("zerocm"))
snapcenter(galaxy, ngalaxy, MassField.offset);
}
local void makedisk()
{
Body *bp;
int i, nzero=0;
real mdsk_i, rad_i, theta_i, vcir_i, omega, Aoort, kappa;
real mu, sig_r, sig_t, sig_z, vrad_i, veff_i, vorb_i;
real z1;
static bool first = TRUE;
disktab = (Body *) allocate(ndisk * sizeof(Body));
for (bp = disktab, i = 0; i < ndisk; bp++, i++) {
Mass(bp) = mdsk[NTAB-1] / ndisk;
mdsk_i = mdsk[NTAB-1] * ((real) i + 1.0) / ndisk;
rad_i = seval(mdsk_i, &mdsk[0], &rdsk[0], &rdsk[NTAB], NTAB);
theta_i = xrandom(0.0, TWO_PI);
Pos(bp)[0] = rad_i * sin(theta_i); /* assign positions */
Pos(bp)[1] = rad_i * cos(theta_i);
if (zmode==0)
Pos(bp)[2] = grandom(0.0, 0.5 * z0); /* gauss */
else if (zmode==1) {
z1 = xrandom(-1.0,1.0);
Pos(bp)[2] = log(1-ABS(z1)) * z0; /* exp */
if (z1<0) Pos(bp)[2] = -Pos(bp)[2];
} else if (zmode==2) {
z1 = frandom(0.0,10.0,mysech2) * z0; /* sech^2 */
if (xrandom(-1.0,1.0) < 0) z1 = -z1;
Pos(bp)[2] = z1;
} else if (zmode==3) {
z1 = frandom(0.0,10.0,myexp) * z0; /* exp */
if (xrandom(-1.0,1.0) < 0) z1 = -z1;
Pos(bp)[2] = z1;
} else
error("zmode=%d not supported yet",zmode);
vcir_i = seval(rad_i, &rcir[0], &vcir[0], &vcir[NTAB], NTAB);
omega = vcir_i / rad_i;
Aoort = - 0.5 *
(spldif(rad_i, &rcir[0], &vcir[0], &vcir[NTAB], NTAB) - omega);
if (omega - Aoort < 0.0)
printf("rad_i, omega, Aoort = %f %f %f\n", rad_i, omega, Aoort);
kappa = 2 * sqrt(omega*omega - Aoort * omega);
mu = alpha*alpha * mdisk * exp(- alpha * rad_i) / TWO_PI;
if (cmode==1) { /* Straight from Josh - mkbaredisk*/
sig_r = 3.358 * Qtoomre * mu / kappa;
sig_t = 0.5 * sig_r * kappa / omega;
sig_z = 0.5 * sig_r;
} else if (cmode==2) {
sig_z = sqrt(PI * mu * z0); /* isothermal sech sheet */
sig_r = 2.0 * sig_z; /* with constant scaleheight */
Qtoomre = sig_r * kappa / (3.358 * mu); /* See vdKruit/Searle */
sig_t = 0.5 * sig_r * kappa / omega;
} else
error("illegal mode=%d",cmode);
vrad_i = grandom(0.0, sig_r);
if (gammas > 0.0) /* Josh' method: averaged */
veff_i = (vcir_i*vcir_i +
(gammas - 3*alpha*rad_i) * sig_r*sig_r);
else /* a little more accurate ? */
veff_i = sqr(vcir_i) - sqr(sig_r) *
(sqr(sig_t/sig_r) - 1.5 + 0.5*sqr(sig_z/sig_r) + 2*alpha*rad_i);
if (veff_i < 0.0) {
nzero++;
veff_i = 0.0;
} else
veff_i = sqrt(veff_i);
vorb_i = veff_i + grandom(0.0, sig_t);
Vel(bp)[0] = /* assign velocities */
(vrad_i * Pos(bp)[0] + vorb_i * Pos(bp)[1]) / rad_i;
Vel(bp)[1] =
(vrad_i * Pos(bp)[1] - vorb_i * Pos(bp)[0]) / rad_i;
Vel(bp)[2] = grandom(0.0, sig_z);
if (Qtab) {
if (first) {
first = FALSE;
printf ("# R M V_circ Ome Kap Aoort mu sig_r sig_t sig_z v_eff Qtoomre sig_t/sig_r sig_z/sig_r fac\n");
}
printf ("%g %g %g %g %g %g %g %g %g %g %g %g %g %g %g\n",
rad_i,mdsk_i,vcir_i,omega,kappa,Aoort,mu,sig_r,sig_t,sig_z,veff_i,
Qtoomre,
sig_t/sig_r,sig_z/sig_r,
1.5-(sqr(sig_t) + 0.5*sqr(sig_z))/sqr(sig_r) );
}
}
if (nzero)
dprintf(0,"Warning: %d stars with too little orbital motion\n",nzero);
if (getbparam("zerocm"))
centersnap(disktab, ndisk);
}
static int
readgen (void)
{
char *data = NULL;
struct stat buf;
off_t start;
if (NULL == (data = malloc ((sizeof *data) * read_length * bpb / 8)))
{
print_error ("Out of memory");
return 1;
}
if (0 != fstat (fileno (infp), &buf))
{
print_error ("%s", strerror (errno));
exit (EXIT_FAILURE);
}
/* pick a random starting point (this assumes that every base is
* byte-aligned) */
srandom (time (NULL));
start = xrandom () % (buf.st_size - read_length*bpb/8);
if (start < 0)
{
print_error ("Input does not contain enough bases.");
exit (EXIT_FAILURE);
}
/* seek to the random position in the file */
if (0 != fseek (infp, start, SEEK_SET))
{
print_error ("Failed to seek to random position in input file");
exit (EXIT_FAILURE);
}
/* actually read from the input file */
if (read_length*bpb/8 != fread (data, 1, read_length*bpb/8, infp))
{
print_error ("Error reading data");
return 1;
}
/* apply any mutations */
if (xrandom () % 100 < mrate1)
data[xrandom () % (read_length*bpb/8)]++;
if (xrandom () % 100 < mrate2)
{
data[xrandom () % (read_length*bpb/8)]++;
data[xrandom () % (read_length*bpb/8)]++;
}
if (xrandom () % 100 < mrate3)
{
data[xrandom () % (read_length*bpb/8)]++;
data[xrandom () % (read_length*bpb/8)]++;
data[xrandom () % (read_length*bpb/8)]++;
}
fwrite (&start, sizeof start, 1, outfp);
fwrite (data, 1, read_length*bpb/8, outfp);
free (data);
return 0;
}
void nemo_main()
{
int i, seed, bits;
real mg, mh, tsnap;
double vx, vy, vz;
double fmax, f0, f1, v2, vmax, vmax2;
bool Qcenter = getbparam("zerocm");
bool Qphi = getbparam("addphi");
stream outstr = stropen(getparam("out"),"w");
mu = getdparam("m");
a = getdparam("a");
seed = init_xrandom(getparam("seed"));
nobj = getiparam("nbody");
if (nobj%2)
warning("Total number of particles reset to %d\n",2*((nobj+1)/2));
nobj = ((nobj+1)/2);
if (hasvalue("headline"))
set_headline(getparam("headline"));
put_history(outstr);
b = a - 1;
btab = (Body *) allocate(2*nobj*sizeof(Body));
for(i=0, bp=btab; i<2*nobj; i++, bp++) {
double eta, radius, cth, sth, phi;
double psi0;
eta = (double) xrandom(0.0,1.0);
radius = rad(eta);
if( i >= nobj ) {
if( mu == 0.0 ) break;
radius *= a;
}
if( i<nobj ) {
galaxy = 1;
} else {
galaxy = 0;
}
phi = xrandom(0.0,2*M_PI);
cth = xrandom(-1.0,1.0);
sth = sqrt(1.0 - cth*cth);
Pos(bp)[0] = (real) (radius*sth*cos(phi));
Pos(bp)[1] = (real) (radius*sth*sin(phi));
Pos(bp)[2] = (real) (radius*cth);
psi0 = -pot(radius);
if (Qphi) Phi(bp) = psi0;
vmax2 = 2.0*psi0;
vmax = sqrt(vmax2);
fmax = f(psi0);
f0 = fmax; f1 = 1.1*fmax; /* just some initial values */
while( f1 > f0 ) {
/* pick a velocity */
v2 = 2.0*vmax2;
while( v2 > vmax2 ) { /* rejection technique */
vx = vmax*xrandom(-1.0,1.0);
vy = vmax*xrandom(-1.0,1.0);
vz = vmax*xrandom(-1.0,1.0);
v2 = vx*vx + vy*vy + vz*vz;
}
f0 = f((psi0 - 0.5*v2));
f1 = fmax*xrandom(0.0,1.0);
}
Vel(bp)[0] = vx;
Vel(bp)[1] = vy;
Vel(bp)[2] = vz;
}
mg = 1.0/nobj;
mh = mu/nobj;
for(i=0, bp=btab; i<2*nobj; i++, bp++) {
if (i<nobj)
Mass(bp) = mg;
else
Mass(bp) = mh;
}
if (Qcenter)
cofm();
bits = MassBit | PhaseSpaceBit;
if (Qphi) bits |= PotentialBit;
nobj *= 2;
tsnap = 0.0;
put_snap(outstr, &btab, &nobj, &tsnap, &bits);
strclose(outstr);
}
