Solved

# random words without repeating

Posted on 2001-06-15
135 Views
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;
};
0
Question by:superquestions
7 Comments

LVL 1

Author Comment

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.
0

LVL 1

Author Comment

for(1..9){#instructions}

You can only modify the #instructions.
0

LVL 1

Author Comment

# 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;
};
0

LVL 1

Author Comment

Why isn't the above script working properly?
0

LVL 6

Expert Comment

try changing

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

to

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

0

LVL 8

Expert Comment

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

LVL 84

Accepted Solution

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