Re: LOGO-L> short question

["Dreyfuss Pierre-Andre" <p.a.dreyfuss@mailexcite.com>]

Hi Pete,

You can write a procedure that store the random moves in a list

to bkrandom
bk first :moves
make "moves bf :moves 
end

to fdrandom
make "moves fput random 150 :moves
fd first :moves
end

Before using those procedures send the command:

make "moves [] to initialize the variable moves to
the empty list This variable can be global or local to the procedure that uses fdrandom and bkrandom.

Fdrandom add a new number to the list bkrandom
goes backward the same amount than the last fdrandom
and remove the number from the list .

You can make any number of fdrandom than the bkrandom
have to be in the reverse order. 

To erase a drawing, you have to change rt in lt and lt in rt 

example:

penreverse 
fdrandom rt 30 fdrandom lt 50 fdrandom

To erase:

bkrandom rt 50 bkrandom lt 30 bkrandom 


Pete Wrote :


>In Microworlds logo:    If I have a random forward command is there a
>reporter or command that would retain that random forward movement so
>that it would move the turtle backwards the same number as the forward
>random movement?
>How would that line read please?
>fd random 150  - and then how to go back exactly the random number
>chosen ?
>
>Thanks very much for this help.
>
>
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