1D-oscillationg w. energy-loss

[joerg]

Help,
the particle should go forth and back and each time he's reaching the wall (+1;-1), he should loss velocity, hence energy! But this results in incomensurability = the new dx doesn't fit into the intervall [-1;1]; here's the code:

double x=0.0;
	double  vx=0.43; 
	int i , frac=7 ;
	double tx=fabs(1/vx);
	double dx=vx*tx/frac;

	
	for (i=0 ; i<=N ; x+=dx , i++)
	{
	printf("%i	%.4f\n",i,x);
	fprintf(f_ptr,"%i %.4f\n",i,x);
	
	if(x<-0.99 || x>0.99)
	dx*=-1.0;

[Salem]

> dx*=-1.0;
How about
dx*=-0.99;

> if(x<-0.99 || x>0.99)
Or maybe make the limits a variable as well.