Ken Allen
11/28/2006 7:17:00 PM
Your problem is with
@deck.sort{rand}
------------------------------------------------------------- Array#sort
array.sort -> an_array
array.sort {| a,b | block } -> an_array
------------------------------------------------------------------------
Returns a new array created by sorting _self_. Comparisons for the
sort will be done using the +<=>+ operator or using an optional
code block. The block implements a comparison between _a_ and _b_,
returning -1, 0, or +1. See also +Enumerable#sort_by+.
a = [ "d", "a", "e", "c", "b" ]
a.sort #=> ["a", "b", "c", "d", "e"]
a.sort {|x,y| y <=> x } #=> ["e", "d", "c", "b", "a"]
rand produces always produces values between 0 and 1 so it will always
sort the same :)
so you need something like this
@deck.sort { if rand < 0.5 then -1; else 1; end }
Ken
Smgspices@aol.com wrote:
>
> In a message dated 11/28/2006 11:08:19 A.M. US Mountain Standard Tim,
> brabuhr@gmail.com writes:
>
>
>> Surely it must be possible to initialize rand with current date and time.
>> Documents seem to indicate this is done with rand(0) or srand with no
>>
> value. I
>
>> have tried both methods and I get the same tired old sequence of numbers. I
>> would write my own random number generator except I don't know how to get a
>> numeric value out of Time.
>>
>
> Can you post the code that isn't working for you?
>
>
>
> I was running the following in SciTE
> class Dominoes
> attr_writer :deck
> def initialize(number)
> @deck= Array.new
> 0.upto(number) {|i| 0.upto(i) {|j| @deck.push([i, j])}}
> end
>
> def shuffle!
> @deck = @deck.sort{rand}
> p @deck
> end
> end
>
> a=Dominoes.new(6)
> a.shuffle!
>
> The p @deck was added so I could see what was being done.
>
> Every time I press F5 I get exactly the same result:
> [[6, 6], [4, 4], [0, 0], [5, 0], [1, 1], ...
> I get the same results if I wait a few minutes or come back the next day. I
> get exactly the same results when I use fxri and freeRIDE. I am running Ruby
> version 1.18.4.
>
> Charlie
>
>