'DEZIGZAG' it generates a matrix given a column vector the sorting is in zigzag like in JPEG (generated using ZIGZAG.m) USE: matriz = dezigzag(linea);
0001 %'DEZIGZAG' it generates a matrix given a column vector 0002 % the sorting is in zigzag like in JPEG (generated using ZIGZAG.m) 0003 % 0004 % USE: matriz = dezigzag(linea); 0005 0006 function aaa=dezigzag(a) 0007 0008 NN=length(a); 0009 0010 N=sqrt(NN); 0011 0012 in=1; 0013 aaa=zeros(N,N); 0014 for i=N-1:-1:1-N, 0015 0016 fin=in+N-1-abs(i); 0017 dia=a(in:fin); 0018 if (i/2-floor(i/2))>0 0019 dia=dia(length(dia):-1:1); 0020 end 0021 eval(['aa',int2str(N-1-abs(i)),'=diag(dia,i);']) 0022 eval(['aaa=aaa+aa',int2str(N-1-abs(i)),';']) 0023 in=fin+1; 0024 0025 end 0026 0027 aaa=fliplr(aaa);