this algrithm can search cycles in LDPC parity check matrix。It contain cycle-4 cycle-6 cycle-8 test algrithm.It also contains a algrithm for generate the LDPC quasi-cyclic parity check matrix

cycle test algrithm\check4cycle.m
...................\check6cycle.m
...................\check8cycle.m
...................\gen_quasiH.m
...................\read me.txt
...................\replace2.m
cycle test algrithm

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