From: "Paulo Sérgio" <psm041@...>
Date: 2005-04-24T07:06:48+09:00
Subject: What im doing WRONG?!?!?!


Hi all, again,
I have a simple piece of code thats returning a unexpected result (to me).

def successors(state) #state is an integer array equal to, for example, 
[0,0,0,0]
    successorsStates = []
    for i in 0...state.length
        break if state[i] != 0
        for j in 1..4
            stateAux = state
            stateAux[i] = j
            puts stateAux.inspect  #(ive put the "puts" methods just to 
ilustrate what is happening)
            successorsStates.push(stateAux) # i've tried 
"successorsStates << stateAux" and "successorsStates.concat([stateAux])" 
too     
            puts successorsStates.inspect #(ive put the "puts" methods 
just to ilustrate what is happening)
        end
    end
    return successorsStates
end

=================================================================================================

I was expecting for successorsStates value:
 [[1,0,0,0],[2,0,0,0],[3,0,0,0],[4,0,0,0],[0,1,0,0],[0,2,0,0],[0,3,0,0],[0,4,0,0],
  
[0,0,1,0],[0,0,2,0],[0,0,3,0],[0,0,4,0],[0,0,0,1],[0,0,0,2],[0,0,0,3],[0,0,0,4]]

but it returns (look at how its concatenates)

[1, 0, 0, 0]
[[1, 0, 0, 0]]
[2, 0, 0, 0]
[[2, 0, 0, 0], [2, 0, 0, 0]]
[3, 0, 0, 0]
[[3, 0, 0, 0], [3, 0, 0, 0], [3, 0, 0, 0]]
[4, 0, 0, 0]
[[4, 0, 0, 0], [4, 0, 0, 0], [4, 0, 0, 0], [4, 0, 0, 0]]
[4, 1, 0, 0] ---*why here the result isn't [0,1,0,0], since stateAux = 
state and then stateAux[i] = j (state = [0,0,0,0])*
[[4, 1, 0, 0], [4, 1, 0, 0], [4, 1, 0, 0], [4, 1, 0, 0], [4, 1, 0, 0]]
[4, 2, 0, 0]
[[4, 2, 0, 0], [4, 2, 0, 0], [4, 2, 0, 0], [4, 2, 0, 0], [4, 2, 0, 0], 
[4, 2, 0, 0]]
[4, 3, 0, 0]
[[4, 3, 0, 0], [4, 3, 0, 0], [4, 3, 0, 0], [4, 3, 0, 0], [4, 3, 0, 0], 
[4, 3, 0, 0], [4, 3, 0, 0]]
[4, 4, 0, 0]
[[4, 4, 0, 0], [4, 4, 0, 0], [4, 4, 0, 0], [4, 4, 0, 0], [4, 4, 0, 0], 
[4, 4, 0, 0], [4, 4, 0, 0], [4, 4, 0, 0]]
[4, 4, 1, 0]
[[4, 4, 1, 0], [4, 4, 1, 0], [4, 4, 1, 0], [4, 4, 1, 0], [4, 4, 1, 0], 
[4, 4, 1, 0], [4, 4, 1, 0], [4, 4, 1, 0], [4, 4, 1, 0]]
[4, 4, 2, 0]
[[4, 4, 2, 0], [4, 4, 2, 0], [4, 4, 2, 0], [4, 4, 2, 0], [4, 4, 2, 0], 
[4, 4, 2, 0], [4, 4, 2, 0], [4, 4, 2, 0], [4, 4, 2, 0], [4, 4, 2, 0]]
[4, 4, 3, 0]
[[4, 4, 3, 0], [4, 4, 3, 0], [4, 4, 3, 0], [4, 4, 3, 0], [4, 4, 3, 0], 
[4, 4, 3, 0], [4, 4, 3, 0], [4, 4, 3, 0], [4, 4, 3, 0], [4, 4, 3, 0], 
[4, 4, 3, 0]]
[4, 4, 4, 0]
[[4, 4, 4, 0], [4, 4, 4, 0], [4, 4, 4, 0], [4, 4, 4, 0], [4, 4, 4, 0], 
[4, 4, 4, 0], [4, 4, 4, 0], [4, 4, 4, 0], [4, 4, 4, 0], [4, 4, 4, 0], 
[4, 4, 4, 0], [4, 4, 4, 0]]
[4, 4, 4, 1]
[[4, 4, 4, 1], [4, 4, 4, 1], [4, 4, 4, 1], [4, 4, 4, 1], [4, 4, 4, 1], 
[4, 4, 4, 1], [4, 4, 4, 1], [4, 4, 4, 1], [4, 4, 4, 1], [4, 4, 4, 1], 
[4, 4, 4, 1], [4, 4, 4, 1], [4, 4, 4, 1]]
[4, 4, 4, 2]
[[4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2], 
[4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2], 
[4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2], [4, 4, 4, 2]]
[4, 4, 4, 3]
[[4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], 
[4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], 
[4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3], [4, 4, 4, 3]]
[4, 4, 4, 4]
*[[4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], 
[4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], 
[4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], 
[4, 4, 4, 4]] *this is the WRONG final state of successorsStates**