/**
* Grade a specific row
*
* @param qtype_matrix_question $question
* @param object $row
* @param array $answers
* @return float
*/
public function grade_row($question, $row, $answers)
{
$is_row_correct = true;
foreach ($question->cols as $col) {
$is_correct = $question->is_correct($row, $col);
$is_answered = $question->is_answered($answers, $row, $col);
if ($is_answered != $is_correct) {
$is_row_correct = false;
break;
}
}
return $is_row_correct ? 1 : 0;
}
/**
* Grade a specific row
*
* @param qtype_matrix_question $question
* @param object $row
* @param array $answers
* @return float
*/
public function grade_row($question, $row, $answers)
{
$row_score = 0;
$row_malus = 0;
foreach ($question->cols as $col) {
$is_correct = $question->is_correct($row, $col);
$is_answered = $question->is_answered($answers, $row, $col);
if ($is_answered) {
$weight = $question->weight($row, $col);
$row_score += $weight > 0 ? $weight : 0;
$row_malus += $weight < 0 ? abs($weight) : 0;
}
}
$row_malus = min(1, $row_malus);
return $row_score - $row_score * $row_malus;
}
/**
*
* @param qtype_matrix_question $question
* @return array
*/
protected static function make_answer_multiple_incorrect($question)
{
$result = array();
foreach ($question->rows as $row) {
$key = $question->key($row, $col = 2);
$result[$key] = 'on';
$key = $question->key($row, $col = 3);
$result[$key] = 'on';
}
return $result;
}
