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function [vect_elt]=zigzag(A);
[n,m] = size(A) ;
vect_elt = A(zigzag_aux(n,m));
function [r,c]=zigzag_aux(n,m)
% ZIGZAG...(Complete H1 line)
% ZIGZAG...(Complete file description)
%
% Author: Jérôme Briot, Matlab 6.1.0.450 (R12.1)
% Contact: dutmatlab@yahoo.fr
% Revision: 1.0 (15-Feb-2007)
% Comments:
%
% Check the number of input arguments
error(nargchk(1,2, nargin))
if nargin==1
m=n;
end
idx=reshape(1:n*m,n,m);
idx=idx(:,end:-1:1);
r=zeros(1,numel(idx));
flag=0;
x=1;
j=1;
flip = 0 ;
if n>m
idx=rot90(idx,3);
idx=idx(:,end:-1:1);
[n,m]=size(idx);
flip = 1;
end
if n==m
dim=min([1:m-1 m m-1:-1:1],n);
else
dim=min([1:n repmat(n,1,m-n-1) n:-1:1],n);
end
for k=m-1:-1:1-m
if isempty(diag(idx,k))
break
end
% if ~flag
if flag
r(x:x+dim(j)-1)=diag(idx,k);
else
r(x+dim(j)-1:-1:x)=diag(idx,k);
end
flag=~flag;
x=x+dim(j);
j=j+1;
end
if flip
r=r(end:-1:1);
end
if nargout==2
[r,c]=ind2sub(size(idx),r);
endfunction [vect_elt]=zigzag(A);
[n,m] = size(A) ;
vect_elt = A(zigzag_aux(n,m));
function [r,c]=zigzag_aux(n,m)
% ZIGZAG...(Complete H1 line)
% ZIGZAG...(Complete file description)
%
% Author: Jérôme Briot, Matlab 6.1.0.450 (R12.1)
% Contact: dutmatlab@yahoo.fr
% Revision: 1.0 (15-Feb-2007)
% Comments:
%
% Check the number of input arguments
error(nargchk(1,2, nargin))
if nargin==1
m=n;
end
idx=reshape(1:n*m,n,m);
idx=idx(:,end:-1:1);
r=zeros(1,numel(idx));
flag=0;
x=1;
j=1;
flip = 0 ;
if n>m
idx=rot90(idx,3);
idx=idx(:,end:-1:1);
[n,m]=size(idx);
flip = 1;
end
if n==m
dim=min([1:m-1 m m-1:-1:1],n);
else
dim=min([1:n repmat(n,1,m-n-1) n:-1:1],n);
end
for k=m-1:-1:1-m
if isempty(diag(idx,k))
break
end
if flag
r(x:x+dim(j)-1)=diag(idx,k);
else
r(x+dim(j)-1:-1:x)=diag(idx,k);
end
flag=~flag;
x=x+dim(j);
j=j+1;
end
if flip
r=r(end:-1:1);
end
if nargout==2
[r,c]=ind2sub(size(idx),r);
end |
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