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random words without repeating

Posted on 2001-06-15
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Last Modified: 2010-03-05
# I have to select three random words three times

@animals=("cat", "rat", "bat");
@unselectedkeys=(0..2);

 for(1..9)
  {
   if(@unselectedkeys==()){@unselectedkeys=(0..2)};

   $randomkey=int rand(@unselectedkeys);

   print $animals[$unselectedkeys[$randomkey]];

   @unselectedkeys=grep{$_!=$randomkey}@unselectedkeys;
 };
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Question by:superquestions
7 Comments
 
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by:superquestions
Comment Utility
What I am trying to do is to select a random element from the array "animals" and keep track if I selected it so that I won't select it again.
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Author Comment

by:superquestions
Comment Utility
for(1..9){#instructions}

You can only modify the #instructions.
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Author Comment

by:superquestions
Comment Utility
# my debugging efforts

@animals=("cat", "rat", "bat");
@unselectedkeys=(0,1,2);

for(1..9)
 {
  # reset array when blank
  if(@unselectedkeys==()){@unselectedkeys=(0..2)};
 
  # select a random key
  $randomkey=int rand(@unselectedkeys);

  # remove the selected key
  @unselectedkeys=grep{$_!=$randomkey}@unselectedkeys;
};
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Author Comment

by:superquestions
Comment Utility
Why isn't the above script working properly?
0
 
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Expert Comment

by:christopher sagayam
Comment Utility
try changing

if(@unselectedkeys==()){@unselectedkeys=(0..2)};
 
 to

if($unselectedkeys[0] eq ""){@unselectedkeys=(0..2)};
 
 
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Expert Comment

by:bebonham
Comment Utility

the problem is that you can get a rand that is not a value in the array...
because you taking the rand on the length an array(1,2) could yeild a rand of 0, but if your array was 1 and 2, then nothing is going to be removed, hence your code fails:


I will see if I can get the grep working, but this is a working solution:


# my debugging efforts

@animals=("cat", "rat", "bat");
@unselectedkeys=(0,1,2);

for(1..9)
{
 # reset array when blank
 if(@unselectedkeys==()){@unselectedkeys=(0..2)};
print @unselectedkeys;
 # select a random key
$randomkey=int rand(1+$#unselectedkeys);
 # remove the selected key
 for($i=0;$i<=$#unselectedkeys;$i++)
{
if($i!=$randomkey)
{
push @ok, $unselectedkeys[$i];
}
}
@unselectedkeys=@ok;
$#ok=-1;
};


Bob
0
 
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Accepted Solution

by:
ozo earned 100 total points
Comment Utility
perldoc -q "How do I shuffle an array randomly?"
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