slope.c
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	#include<stdio.h>
	#include<math.h>
	#include<fonction.h>
	#include<constant.h>
	#include<dimension.h>
	#include<structure.h>

	/****************************************************************/
	/* nom: slope */
	/* auteur: Jean-Paul Kneib */
	/* date: 10/02/92 */
	/* place: Toulouse */
	/* */
	/* determination de la pente entre 2 points */
	/****************************************************************/

	double slope(double x0, double y0, double x1, double y1)
	{
	const extern struct g_mode M;
	if (x0 != x1)
	return((y1 - y0) / (x1 - x0));
	else
	{
	NPRINTF(stderr, "WARNING: slope not determined [%lf,%lf], 0. assumed\n", x0, x1);
	return(x1 - x0);
	}
	}