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Make ministat(1) vastly faster on huge datasets.

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This commit is contained in:
Poul-Henning Kamp 2008-10-16 20:39:02 +00:00
parent df38b76405
commit c4f431a628
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=183960
2 changed files with 36 additions and 51 deletions
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4
usr.bin/ministat/Makefile
View file

@ -8,7 +8,7 @@ LDADD= -lm
test: ${PROG}
./${PROG} < ${.CURDIR}/chameleon
./${PROG} ${.CURDIR}/chameleon
./${PROG} ${.CURDIR}/chameleon ${.CURDIR}/iguana
./${PROG} -c 80 ${.CURDIR}/chameleon ${.CURDIR}/iguana
./${PROG} ${.CURDIR}/iguana ${.CURDIR}/chameleon
./${PROG} -c 80 ${.CURDIR}/iguana ${.CURDIR}/chameleon
./${PROG} -s -c 80 ${.CURDIR}/chameleon ${.CURDIR}/iguana
./${PROG} -s -c 80 ${.CURDIR}/chameleon ${.CURDIR}/iguana ${.CURDIR}/iguana

83
usr.bin/ministat/ministat.c
View file

@ -131,11 +131,10 @@ double student [NSTUDENT + 1][NCONF] = {
#define MAX_DS 8
static char symbol[MAX_DS] = { ' ', 'x', '+', '*', '%', '#', '@', 'O' };
TAILQ_HEAD(pointlist, point);
struct dataset {
char *name;
struct pointlist list;
double *points;
unsigned lpoints;
double sy, syy;
int n;
};
@ -146,51 +145,39 @@ NewSet(void)
struct dataset *ds;
ds = calloc(1, sizeof *ds);
TAILQ_INIT(&ds->list);
ds->lpoints = 100000;
ds->points = calloc(sizeof *ds->points, ds->lpoints);
return(ds);
}
struct point {
TAILQ_ENTRY(point) list;
double val;
};
static void
AddPoint(struct dataset *ds, double a)
{
struct point *pp, *pp2;
double *dp;
pp = calloc(1, sizeof *pp);
pp->val = a;
ds->n++;
if (ds->n >= ds->lpoints) {
dp = ds->points;
ds->lpoints *= 4;
ds->points = calloc(sizeof *ds->points, ds->lpoints);
memcpy(ds->points, dp, sizeof *dp * ds->n);
}
ds->points[ds->n++] = a;
ds->sy += a;
ds->syy += a * a;
if (TAILQ_EMPTY(&ds->list)) {
TAILQ_INSERT_HEAD(&ds->list, pp, list);
return;
}
TAILQ_FOREACH(pp2, &ds->list, list) {
if (pp->val < pp2->val) {
TAILQ_INSERT_BEFORE(pp2, pp, list);
return;
}
}
TAILQ_INSERT_TAIL(&ds->list, pp, list);
}
static double
Min(struct dataset *ds)
{
return (TAILQ_FIRST(&ds->list)->val);
return (ds->points[0]);
}
static double
Max(struct dataset *ds)
{
return(TAILQ_LAST(&ds->list, pointlist)->val);
return (ds->points[ds->n -1]);
}
static double
@ -206,23 +193,7 @@ Median(struct dataset *ds)
int even, i;
struct point *p1, *p2;
if ((ds->n % 2) == 1) {
i = (ds->n / 2) + 1;
even = 0;
} else {
i = ds->n / 2;
even = 1;
}
TAILQ_FOREACH(p1, &ds->list, list) {
--i;
if (i == 0)
break;
}
if (even) {
p2 = TAILQ_NEXT(p1, list);
return ((p2->val + p1->val) / 2);
}
return (p1->val);
return (ds->points[ds->n / 2]);
}
static double
@ -346,7 +317,7 @@ PlotSet(struct dataset *ds, int val)
{
struct plot *pl;
struct point *pp;
int i, j, m, x;
int i, j, m, x, n;
int bar;
pl = &plot;
@ -370,8 +341,8 @@ PlotSet(struct dataset *ds, int val)
m = 1;
i = -1;
j = 0;
TAILQ_FOREACH(pp, &ds->list, list) {
x = (pp->val - pl->x0) / pl->dx;
for (n = 0; n < ds->n; n++) {
x = (ds->points[n] - pl->x0) / pl->dx;
if (x == i) {
j++;
if (j > m)
@ -389,8 +360,8 @@ PlotSet(struct dataset *ds, int val)
}
pl->height = m;
i = -1;
TAILQ_FOREACH(pp, &ds->list, list) {
x = (pp->val - pl->x0) / pl->dx;
for (n = 0; n < ds->n; n++) {
x = (ds->points[n] - pl->x0) / pl->dx;
if (x == i) {
j++;
} else {
@ -463,6 +434,19 @@ DumpPlot(void)
putchar('\n');
}
static int
dbl_cmp(const void *a, const void *b)
{
const double *aa = a;
const double *bb = b;
if (*aa < *bb)
return (-1);
else if (*aa > *bb)
return (1);
else
return (0);
}
static struct dataset *
ReadSet(const char *n, int column, const char *delim)
@ -515,6 +499,7 @@ ReadSet(const char *n, int column, const char *delim)
"Dataset %s must contain at least 3 data points\n", n);
exit (2);
}
qsort(s->points, s->n, sizeof *s->points, dbl_cmp);
return (s);
}