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Re: Run a program


From: Buchs, Kevin
Subject: Re: Run a program
Date: Tue, 27 Sep 2011 17:01:14 -0500

Roland, 

Please consider using some indentation in your code postings, as we are left 
swimming in the parens if you don't. 

It is also inexplicable by me that repartition is maintaining a value, despite 
the let form. It is not recognized globally. You can see that with the 
additional message form I inserted. Then in addition, I did explicit 
initialization of each element.

(defun coins (n)
   (let 
      (  (i n) 
         (repartition [0 0 0])
         (c1 0)
         (c2 0)
         (r 0)) 
  
      (message "repartition starts at: %s " repartition)
      (aset repartition 0 0)
      (aset repartition 1 0)
      (aset repartition 2 0)
      (while (> i 0) 
          (setq c1 (random 2)) 
          (setq c2 (random 2))
          (setq r (+ c1 c2))
          (aset repartition r (1+ (aref repartition r))) 
          (setq i (- i 1))) 
      (message " repartition %s " repartition)))

Kevin Buchs   |  Senior Engineer  |  Department of Physiology and Biomedical 
Engineering - SPPDG
507-538-5459  |address@hidden  |  http://www.mayo.edu/sppdg
Mayo Clinic  |  200 1st St. SW  |  Rochester, MN 55905  


> (defun coins (n)
> (let ((i n) (repartition [0 0 0]) (c1 0) (c2 0) (r 0)) (while (> i 0) 
> (setq c1 (random 2)) (setq c2 (random 2)) (setq r (+ c1 c2)) (aset 
> repartition r (1+ (aref repartition r))) (setq i (- i 1))) (message " 
> repartition %s " repartition)))


I am not exactly sure why that happens, but it seems like you're referencing 
the same vector after each call.  To make sure the vector is fresh before each 
run, replace:
(repartition [0 0 0])
with:
(repartition (make-vector 3 0))



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