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/* XLISP-STAT 2.1 Copyright (c) 1990, by Luke Tierney */
/* Additions to Xlisp 2.1, Copyright (c) 1989 by David Michael Betz */
/* You may give out copies of this software; for conditions see the */
/* file COPYING included with this distribution. */
#include "xlisp.h"
#include "xlstat.h"
#include "gnuplot.h"
extern LVAL coerce_to_list();
#ifndef ANSI
extern char *calloc();
#endif
static double NiceValue(x)
double x;
{
long ilx;
double lx, v1, v2, v3, v4;
if (x <= 0) return (0.0);
else {
lx = log(x) / log(10.0);
ilx = floor(lx);
v1 = pow(10.0, (float) ilx);
v2 = pow(10.0, (float) ilx) * 2.0;
v3 = pow(10.0, (float) ilx) * 5.0;
v4 = pow(10.0, (float) ilx + 1);
if ((fabs(x - v1) < fabs(x - v2))
&& (fabs(x - v1) < fabs(x - v3))
&& (fabs(x - v1) < fabs(x - v4)))
return(v1);
else if ((fabs(x - v2) < fabs(x - v3))
&& (fabs(x - v2) < fabs(x - v4)))
return(v2);
else if (fabs(x - v3) < fabs(x - v4))
return(v3);
else
return(v4);
}
}
static SetNiceRange(xmin, xmax, ticks)
double *xmin, *xmax;
int *ticks;
{
double delta;
if ((*xmax <= *xmin) || (*ticks < 2)) return;
delta = NiceValue((*xmax - *xmin) / (*ticks - 1));
*xmin = floor(*xmin / delta) * delta;
*xmax = ceil(*xmax / delta) * delta;
*ticks = 1 + (.01 + (*xmax - *xmin) / delta);/* add .01 for rounding */
}
static set_range(low, high)
double *low, *high;
{
int ticks = 4;
if (*low == *high) {
(*low)--;
(*high)++;
}
else SetNiceRange(low, high, &ticks);
}
static LVAL gnupointlineplot(plot_style)
enum PLOT_STYLE plot_style;
{
LVAL next, nextx, nexty;
int n, i;
struct curve_points *this_plot, real_plot;
struct coordinate *pts;
double xmin, xmax, ymin, ymax, dx, dy;
LVAL x, y;
xlstkcheck(2);
xlsave(x);
xlsave(y);
x = xlgetarg();
if (consp(x) && seqp(car(x))) {
y = car(cdr(x));
x = car(x);
}
else y = xlgetarg();
x = coerce_to_list(x);
y = coerce_to_list(y);
n = llength(x);
if (llength(y) != n) xlfail("lengths do not match");
for (next = x; consp(next); next = cdr(next))
if (! realp(car(next))) xlerror("not a real number", car(next));
for (next = y; consp(next); next = cdr(next))
if (! realp(car(next))) xlerror("not a real number", car(next));
pts = (struct coordinate *) calloc(sizeof(struct coordinate), n);
if (! pts) xlfail("allocation failed");
this_plot = &real_plot;
this_plot->points = (struct coordinate *) pts;
this_plot->next_cp = 0;
this_plot->plot_type = DATA;
this_plot->plot_style = plot_style;
this_plot->title = "";
this_plot->p_count = n;
xmin = HUGE;
xmax = -HUGE;
ymin = HUGE;
ymax = -HUGE;
for(i = 0, nextx = x, nexty = y; i < n;
i++, nextx = cdr(nextx), nexty = cdr(nexty)) {
dx = makefloat(car(nextx));
dy = makefloat(car(nexty));
this_plot->points[i].undefined = FALSE;
this_plot->points[i].x = dx;
this_plot->points[i].y = dy;
if (dx > xmax) xmax = dx;
if (dx < xmin) xmin = dx;
if (dy > ymax) ymax = dy;
if (dy < ymin) ymin = dy;
}
set_range(&xmin, &xmax);
set_range(&ymin, &ymax);
do_plot(this_plot, 1, xmin, xmax, ymin, ymax);
free(pts);
xlpopn(2);
return(NIL);
}
LVAL gnupointplot() { return(gnupointlineplot(POINTS)); }
LVAL gnulineplot() { return(gnupointlineplot(LINES)); }
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