Model
public function telat($bulan)
    {
        $this->db->select('id_nilai, nama, telat, lembur, absen, kompetensi, bulan');
        $this->db->from('penilaian');
        $this->db->where('bulan', $bulan);
        $query_telat = $this->db->get();
        return $query_telat->result();
    }


Controller
        $bulan = $this->input->post('bulan_com');
        $telat = $this->hitung_model->telat($bulan);
        foreach ($telat as $r) {
            $a[] = $r->telat;
            $b[] = $r->lembur;
            $c[] = $r->absen;
            $d[] = $r->kompetensi;
            $e[] = $r->id_nilai;
            $f[] = $r->nama;
            $g[] = $r->bulan;
        }
        $tl = $a;
        $lm = $b;
        $abs = $c;
        $komp = $d;
        $id_nilai = $e;
        $nama = $f;
        $bulan = $g;
        //Variable2 di atas akan dihitung dengan rumus matematika  tertentu.