how to clear this error???

 Attempted to access offset(1,:); index out of bounds because
 size(offset)=[0,2].

 Error in PydXcorr (line 40)
 offset1 = [offset1;offset(1,:)];

 Error in test (line 120)
 [ybegin,xbegin,yend,xend] = PydXcorr(img22,temp11,2);

here my code.... function [ybegin,xbegin,yend,xend] = PydXcorr(img,tmp,level,thresh)

warning off;

if nargin == 3 thresh = 0.7; end

[Irows,Icolumns,Ilayers] = size(img); [Trows,Tcolumns,Tlayers] = size(tmp); % if is RGB, transform to GRAYSCALE if (Ilayers==3) img = rgb2gray(img); end if (Tlayers==3) tmp = rgb2gray(tmp); end

% time on hbar = waitbar(0,'Image matching'); tic;

% decomposition imgpyd = Decomposition(img,level); tmppyd = Decomposition(tmp,level);

% match in low resolution image

% calculate cross-correlation c = normxcorr2(tmppyd{level+1},imgpyd{level+1});

% get peak value and position [ymax,xmax] = find(abs(c)>thresh); offset = [ymax-size(tmppyd{level+1},1),... xmax-size(tmppyd{level+1},2)];

% delete repeated match point offset1 = []; offset1 = [offset1;offset(1,:)]; for n1 = 2:size(offset,1) m = 0; for n2 = 1:size(offset1,1) if (abs(offset(n1,1)-offset1(n2,1))>3 && ... abs(offset(n1,2)-offset1(n2,2))>3 ) m = m+1; end end if m == size(offset1,1) offset1 = [offset1;offset(n1,:)]; end end yoffset = offset1(:,1); xoffset = offset1(:,2);

% match in high resolution images

ii = level; while ii i = 1; n = length(yoffset); while i <= n % get the ROI yobj1 = 2*yoffset(i)-10; yobj2 = 2*yoffset(i)+size(tmppyd{ii},1)+10; xobj1 = 2*xoffset(i)-10; xobj2 = 2*xoffset(i)+size(tmppyd{ii},2)+10; if yobj1<=0 yobj1 = 1; end if xobj1<=0 xobj1 = 1; end if yobj2>size(imgpyd{ii},1) yobj2 = size(imgpyd{ii},1); end if xobj2>size(imgpyd{ii},2) xobj2 = size(imgpyd{ii},2); end objarea = imgpyd{ii}(yobj1:yobj2,xobj1:xobj2);

        % match in ROI
        c = normxcorr2(tmppyd{ii},objarea);
        [max_c,imax] = max(abs(c(:)));
        if max_c > thresh
            [ypeak,xpeak] = ind2sub(size(c),imax(1));
            corr_offset = [ypeak-size(tmppyd{ii},1),...
                        xpeak-size(tmppyd{ii},2)];
            offset = corr_offset;
            yoffset(i) = offset(1)+2*yoffset(i)-10-1;
            xoffset(i) = offset(2)+2*xoffset(i)-10-1;
            i = i+1;
        else
            yoffset(i) = [];
            xoffset(i) = [];
            n = n-1;
        end
    end
    ii = ii-1;
end

% get the offset in the source image ybegin = yoffset; yend = yoffset+size(tmppyd{1},1)-1; xbegin = xoffset; xend = xoffset+size(tmppyd{1},2)-1;

% time off toc; close(hbar);