function validation($data)
{
$errors = parent::validation($data, null);
$colcount = matrix_qtype::count_form_rows_or_cols($data, false);
$rowcount = matrix_qtype::count_form_rows_or_cols($data);
if ($rowcount == 0) {
$errors['rowshort[0]'] = get_string('mustdefine1by1', 'qtype_matrix');
}
if ($colcount == 0) {
$errors['colshort[0]'] = get_string('mustdefine1by1', 'qtype_matrix');
}
if (array_key_exists('grademethod', $data)) {
$grademethod = $data['grademethod'];
} else {
$grademethod = matrix_qtype::single_default_grademethod();
}
if ($grademethod == QTYPE_MATRIX_GRADING_WEIGHTED && empty($data['multiple'])) {
$errors['multiple'] = get_string('weightednomultiple', 'qtype_matrix');
}
$gradeclass = matrix_qtype::grade_class($grademethod, $data['multiple']);
$matrixerrors = $gradeclass->validate_defining_form_matrix($data);
$errors = array_merge($errors, $matrixerrors);
return $errors ? $errors : true;
}
function grade_responses(&$question, &$state, $cmoptions)
{
$gradeclass = matrix_qtype::grade_class($question->options->grademethod, $question->options->multiple);
if ($gradeclass->is_manual_graded()) {
$state->raw_grade = 0;
$state->penalty = 0;
return true;
}
$gradeclass->set_weights($question->options->weights);
$subqs = $gradeclass->grade_matrix($state->responses);
$state->raw_grade = $gradeclass->grade_question($subqs);
//
// Make sure we don't assign negative or too high marks.
$state->raw_grade = min(max((double) $state->raw_grade, 0.0), 1.0) * $question->maxgrade;
// Update the penalty.
$state->penalty = $question->penalty * $question->maxgrade;
// mark the state as graded
$state->event = $state->event == QUESTION_EVENTCLOSE ? QUESTION_EVENTCLOSEANDGRADE : QUESTION_EVENTGRADE;
return true;
}
public function validate_defining_form_matrix($data)
{
// each row must have the positive weight value adding up to 100
$matrix = matrix_qtype::formdata_to_matrix($data);
$errors = array();
foreach ($matrix as $row) {
$positivevalue = 0;
foreach ($row as $cell) {
if ($cell < 0) {
continue;
}
$positivevalue += $cell;
}
if (ceil($positivevalue) != 1) {
$errors['gradingmatrix'] = get_string('mustaddupto100', 'qtype_matrix');
}
}
return $errors;
}
