📄 h_20_3_4.m
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%(20,3,4) check metrix, whose gap is 3 and girth is more than 4.
H =[ 1 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0
1 0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0
0 0 1 0 0 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0
0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 0 0 0 0 0
0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 1 0 0
0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 1 1 0
0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 1 0 0 1
0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 1
0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 1 0];
%对上面的H进行了列置换,从而保证编码的顺利进行
H =[1 0 1 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0
1 0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0
0 1 1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0
0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 0 0 0 0 0
0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 1 0 0
0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0
0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 1 0 0 1
0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 1
0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 1 0];
C =[
1 0 0 0 0 0 1 0 11 0 6 0 11 0 1 0 0 0 0 0 1
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