/* Resets the state for all the aggregate functions. */
static void
initialize_aggregate_info (struct agr_proc *agr)
{
struct agr_var *iter;
for (iter = agr->agr_vars; iter; iter = iter->next)
{
iter->saw_missing = false;
iter->dbl[0] = iter->dbl[1] = iter->dbl[2] = 0.0;
iter->int1 = iter->int2 = 0;
switch (iter->function)
{
case MIN:
iter->dbl[0] = DBL_MAX;
break;
case MIN | FSTRING:
memset (iter->string, 255, var_get_width (iter->src));
break;
case MAX:
iter->dbl[0] = -DBL_MAX;
break;
case MAX | FSTRING:
memset (iter->string, 0, var_get_width (iter->src));
break;
case MEDIAN:
{
struct caseproto *proto;
struct subcase ordering;
proto = caseproto_create ();
proto = caseproto_add_width (proto, 0);
proto = caseproto_add_width (proto, 0);
if ( ! iter->subject)
iter->subject = dict_create_internal_var (0, 0);
if ( ! iter->weight)
iter->weight = dict_create_internal_var (1, 0);
subcase_init_var (&ordering, iter->subject, SC_ASCEND);
iter->writer = sort_create_writer (&ordering, proto);
subcase_destroy (&ordering);
caseproto_unref (proto);
iter->cc = 0;
}
break;
case SD:
if (iter->moments == NULL)
iter->moments = moments1_create (MOMENT_VARIANCE);
else
moments1_clear (iter->moments);
break;
default:
break;
}
}
}
/* Initializes one-pass moments M for calculating moment
MAX_MOMENT and lower moments. */
static void
init_moments1 (struct moments1 *m, enum moment max_moment)
{
assert (m != NULL);
assert (max_moment == MOMENT_MEAN || max_moment == MOMENT_VARIANCE
|| max_moment == MOMENT_SKEWNESS || max_moment == MOMENT_KURTOSIS);
m->max_moment = max_moment;
moments1_clear (m);
}
