MATLAB: How to solve this error (index must be a positive integer or logical)

image processing

function s = subim(f, m, n, rx, cy)
%SUBIM Extracts a subimage, s, from a given image, f.
%The subimage is of size m-by-n, and the coordinates of its top, left corner are (rx, cy).
s = zeros(m, n);
rowhigh = rx + m - 1;
colhigh = cy + n - 1;
xcount = 0;
for r = rx:rowhigh
    xcount = xcount + 1;
    ycount = 0;
    for c = cy:colhigh
        ycount = ycount + 1;
        s(xcount, ycount) = f(r, c);
    end
end
I am try to run the code, but this got error. Attempted to access f(0,0); index must be a positive integer or logical.
f = imread('13100.jpg');
[m,n]=size(f);
s = zeros(m, n);
rx = 0;
cy = 0;
s = zeros(m, n); 
rowhigh = rx + m - 1; 
colhigh = cy + n - 1; 
xcount = 0;  
for r = rx:rowhigh 
    xcount = xcount + 1;
    ycount = 0; 
    for c = cy:colhigh 
        ycount = ycount + 1;
        s(xcount, ycount) = f(r, c); 
    end
end
%

Best Answer

This:
rx = 0;
cy = 0;
Should be
rx = 1;
cy = 1;
You are taking indices 0, note that, matlab will not take -ve or zero indices. Indices should be +ve integers.
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