#include "mplot.h"void range(double x0, double y0, double x1, double y1){	e1->xmin = x0;	e1->ymin = y0;	e1->scalex = e1->sidex / (x1 - x0 );	e1->scaley = e1->sidey / (y1 - y0 );	e1->quantum=e0->quantum/sqrt(e1->scalex*e1->scalex +		e1->scaley*e1->scaley);	if(e1->quantum < .01)		e1->quantum = .01;}