LDPC generator matrix G

Dear Forum

In the MATLAB examples the LDPC generator matrix G for AR4JA length 1024 rate 4/5 is size 32 x 256.

There is any way to convert this to the quasi cycle matrix H 1024 x 1280 ? OR in the prototype matrix P so i can use 'ldpcQuasiCycleMatrix' function ?

Thank you

Andrei