Re: FRESH project - Supervisor Dr. A. Helmy

Hello Hemen, 

> Dear Henri,
> 
> Thank you for the prompt reply earlier.
> Ok right now i am facing a small problem with billiards model when i am increasing the speed . The direction does not get changed if the speed is increased.

I'm not sure I understand this part. Why would you expect the direction to 
change when the speed is increased?

> line:::::125
> method private new_direction = (
>      (* let rad = (Random.float rnd (2. *. pi)) -. pi in 
>       polar 1.0 rad;*)
>  if (Random.int rnd 2 = 0) then (
>        let rad = pi in polar 1.0 rad)
>     else (
>       let rad = pi/. 2. in polar 1.0 rad )
> )

btw a minor point: the above if statement can be simply written as:

if (Random.int rnd 2 = 0) then 
    polar 1.0 pi 
  else 
    polar 1.0 (pi /. 2.)


> I just want the nodes to move N S E W and refelect back but when i am implementing this nodes move N-S for a vey long time and donot change direction. 

It looks like you uncovered a bug ;) 
I was computing the wrong lambda which was making the next direction 
change be much too far ahead in time. I've attached a patch fixing this. 
Please let me know if you still don't see the expected behavior with the 
patch.

> Also how can i restrict the nodes to a grid like structure like you have 
> done in EPFL ..could you provide me with some pointers to this.

will answer in a separate email.

henri

> 
> Thanking you and awaiting your response.
> 
> Sincerely,
> HEMEN R.VIMADALAL
> B.S. ELECTRONICS ENGINEERING(Mumbai University)
> M.S. ELECTRICAL ENGINEERING(U S C)
> Phone # (323)620 6279
> 
> 
>