dezigzag

PURPOSE ^

'DEZIGZAG' reshape a vector into a matrix using 'zigzag' sorting

SYNOPSIS ^

function aaa=dezigzag(a)

DESCRIPTION ^

'DEZIGZAG' reshape a vector into a matrix using 'zigzag' sorting


 USE: matriz = dezigzag(vector);

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 %'DEZIGZAG' reshape a vector into a matrix using 'zigzag' sorting
0002 %
0003 %
0004 % USE: matriz = dezigzag(vector);
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);

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