I’m installing apriori algorithm. I want to take 1-itemset but when I combine array, the result is not exactly (before and after combine, the result is not match). Here is my code:
<?php
$transactions = array(
array('A' => 1, 'B' => 0, 'C' => 1, 'D' => 1, 'E' => 0),
array('A' => 0, 'B' => 1, 'C' => 1, 'D' => 0, 'E' => 1),
array('A' => 1, 'B' => 1, 'C' => 1, 'D' => 0, 'E' => 1),
array('A' => 0, 'B' => 1, 'C' => 0, 'D' => 0, 'E' => 1)
);
// take keys of $transactions and add into $items
while(list($key)=each($transactions[1])){
$items[] = $key;
}
// count quantity of each item in $items
for($i=0; $i<count($transactions); $i++){
for($j=0; $j<count($items); $j++){
if($transactions[$i][$items[$j]]==1){
$support[$j]++;
}
}
}
echo 'Before combine: (I want to the result like this)<br />';
for($i=0; $i<count($support); $i++){
echo $support[$i],'-',$items[$i];
echo '<br />';
}
$itemset1 = array_combine($items, $support);
echo '<br />';
echo 'After combine: <br />';
while(list($key, $value)=each($itemset1)){
echo $key,'-',$value;
echo '<br />';
}
?>
Before combine (I want to the result like this):
A-2
B-3
C-3
D-1
E-3
After combine:
A-2
B-3
C-1
D-3
E-3
Please help me! Thank a lot!