public function postPreference()
{
$preference = Input::get('preference');
$user = Auth::user();
foreach ($preference as $id => $score) {
$userpreference = $user->visualizations()->where('id', $id)->first();
if ($userpreference === null) {
$visualization = \App\Visualization::find($id);
$user->visualizations()->attach($visualization, ['knowledge' => $score]);
} else {
$userpreference->pivot->knowledge = $score;
$userpreference->pivot->save();
$userpreference->save();
}
}
return redirect('home');
}
public function generatePrediction($similaritems, $vectors)
{
$weight = 0;
$sum = 0;
$user = Auth::user();
$users = \App\User::all();
$index = 0;
for ($i = 0; $i < count($users); $i++) {
if ($users[$i]->id == $user->id) {
$index = $i;
break;
}
}
foreach ($similaritems as $similaritem) {
$visualization = Visualization::find($similaritem->visualization);
$rating = $vectors[$similaritem->visualization - 1][$index];
$weight += $similaritem->similarity * $rating;
$sum += $similaritem->similarity;
}
return $weight / $sum;
}