Nested foreach - show data by year

[eluser]someone [/eluser]
Hello!

I'm working on some script which must use year as exposed value. This information is saved in database and I have to pull it out, but that's not the problem. I have to create list where are years exposed as main values. I was working on code, but I always get an error.

Controller:

Code:

$data['dbdata'] = $this->DBdata->serve_val('pc_year');
            foreach ($data['dbdata']->result() as $data)
            {
                $data['sheet'] = $this->DBdata->serve_val('pc');
                foreach ($data['sheet']->result() as $sht)
                {
                    $data['vdata'][$data->idyr][$sht->idpc]['name'] = $sht->name;
                    $data['vdata'][$data->idyr][$sht->idpc]['properties'] = $sht->properties;
                }
            }

View:

Code:

foreach ($dbdata->result() as $data)
    {
        echo $data->year."<br>";
        foreach ($sheet->result() as $sht)
        {
                echo $vdata[$data->idyr][$sht->idpc]['name']."<br>";
                echo $vdata[$data->idyr][$sht->idpc]['properties']."<br>";
                echo "<br>";
        }
    }

Error:
A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 1


How to do this correctly?

Thanks! :-)

[eluser]jmadsen[/eluser]
what line is the error pointing to?

[eluser]someone [/eluser]
Error is pointing to

Code:

echo $vdata[$data->idyr][$sht->idpc]['name']."<br>";
echo $vdata[$data->idyr][$sht->idpc]['properties']."<br>";

In view.