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POSubscript indices must either be real positive integers or logicals Error + Code
 

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  1. POSubscript indices must either be real positive integers or logicals Error + Code
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    <p>I was wondering if someone can explain to me what this error means. And, if possible, how to resolve it? ??? Subscript indices must either be real positive integers or logicals.</p> <pre><code>Error in ==&gt; interp2&gt;linear at 344 F = ( arg3(ndx).*(onemt) + arg3(ndx+1).*t ).*(1-s) + ... Error in ==&gt; interp2 at 220 zi = linear(ExtrapVal,x,y,z,xi,yi); Error in ==&gt; snake at 71 ssx = gamma*xs - kappa*interp2(fx,xs,ys); </code></pre> <p>This is my complete code:</p> <pre><code>image = imread('image.jpg'); %parameters alpha = 0.001; beta = 0.4; kappa=0.0001; gamma = 100; N = 100; wl = 10; we = 10; wt = 10; smth = rgb2gray(image); % Calculating size of image [row col] = size(image) eline = smth; %eline is simply the image intensities [grady,gradx] = gradient(double(smth)); eedge = -1 * sqrt ((gradx .* gradx + grady .* grady)); %eedge is measured by gradient in the image m1 = [-1 1]; m2 = [-1;1]; m3 = [1 -2 1]; m4 = [1;-2;1]; m5 = [1 -1;-1 1]; cx = conv2(smth,m1,'same'); cy = conv2(smth,m2,'same'); cxx = conv2(smth,m3,'same'); cyy = conv2(smth,m4,'same'); cxy = conv2(smth,m5,'same'); for i = 1:700 for j= 1:900 % eterm as deined in Kass et al Snakes paper eterm(i,j) = (cyy(i,j)*cx(i,j)*cx(i,j) -2 *cxy(i,j)*cx(i,j)*cy(i,j) + cxx(i,j)*cy(i,j)*cy(i,j))/((1+cx(i,j)*cx(i,j) + cy(i,j)*cy(i,j))^1.5); end end eext = (double(wl.*eline) + double(we.*eedge -wt) .* eterm); %eext as a weighted sum of eline, eedge and eterm [fx, fy] = gradient(eext); %computing the gradient xs=1:900; xs=xs'; ys=repmat(242,1,900); ys=ys' [m n] = size(xs); [mm nn] = size(fx); %populating the penta diagonal matrix A = zeros(m,m); b = [(2*alpha + 6 *beta) -(alpha + 4*beta) beta]; brow = zeros(1,m); brow(1,1:3) = brow(1,1:3) + b; brow(1,m-1:m) = brow(1,m-1:m) + [beta -(alpha + 4*beta)]; % populating a template row for i=1:m A(i,:) = brow; brow = circshift(brow',1)'; % Template row being rotated to egenrate different rows in pentadiagonal matrix end [L U] = lu(A + gamma .* eye(m,m)); Ainv = inv(U) * inv(L); % Computing Ainv using LU factorization %moving the snake in each iteration for i=1:N; ssx = gamma * xs - kappa * interp2(fx,xs,ys); %This is where I receive the error ssy = gamma * ys - kappa * interp2(fy,xs,ys); %calculating the new position of snake xs = Ainv * ssx; ys = Ainv * ssy; %Displaying the snake in its new position % imshow(image,[]); % hold on; plot([xs; xs(1)], [ys; ys(1)], 'r-'); % hold off; % pause(0.001) end; </code></pre>
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    1. USAndrew Jackson
    1. USAndrew Jackson
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      1. POSubscript indices must either be real positive integers or logicals Error + Code
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    1. COalpha = 0.001; beta = 0.4; kappa=0.0001; gamma = 100; N = 100; wl = 10; we = 10; wt = 10; my appologies
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      1. POSubscript indices must either be real positive integers or logicals Error + Code
      1. USAndrew Jackson
    2. COI have updated the question with my code
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      1. POSubscript indices must either be real positive integers or logicals Error + Code
      1. USAndrew Jackson
    3. COAlso see [this question](http://stackoverflow.com/questions/20054047/subscript-indices-must-either-be-real-positive-integers-or-logicals-generic-sol) for [the generic solution to this problem](http://stackoverflow.com/a/20054048/983722).
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      1. POSubscript indices must either be real positive integers or logicals Error + Code
      1. USDennis Jaheruddin
 

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