Re: position with random coordinates

[zehava wizman <zehavawi1@xxxxxxxxx>]

Hello Marian!
  Thanks about your good advise, I will try it!
                  Zehava Wizman

Marian Rosen <mbrosen@xxxxxxxxx> wrote:
  Zehava,  

  Several people have suggested to you the solution of using the word list 
instead of the brackets [ ]. 
  setpos list :x :y  ( works )         VS setpos  [:x :y]  (which doesn't work)
  

  I taught Kg-6th graders and did not find it easy to explain to them why the 
brackets won't evaluate the variables. So, here is an alternative method that 
I is less abstract and has the advantage of having kids think through the 
significance of 360 degrees. We didn't usually study coordinates until 4th 
grade, so the following was also a very useful solution for younger kids.
  

  to throw
    rt random 360
    fd random 9999
  end
  

  "Throw" works best if you are throwing a turtle any where on the screen.  If 
kids were writing a game in which they wanted the turtle to land in a specific 
area, they often worked out a solution in which the turtle checked what color 
it had landed on and then either did or did not do another "throw" depending 
on the result they wanted.  
  

  P.S. Giving credit where credit is true, I think this alternative may have 
been suggested to me by Michael Tempel back in 1983... but maybe not. I would 
certainly like to think I self-generated it!  It was simple, it worked, and 
kids "got it".
  

  
    On Jan 6, 2007, at 3:36 AM, zehava wizman wrote:

    Hello Forum!
  first of all,  thanks about your quick and useful answers to my problems.
  Another 2 questions:
  1. How can I used random with setpos instruction?
  I tried to write some version like setpos [random 200 random 190],or to make 
"x random 200 make "y random 190 ,and then setpos [:x :y].
  2. How can I limit all my  turtles to move only between some values of the 
screen?
                         thanks, Zehava Wizman
   
   
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