How is curve fitting in image processing?

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I use the following code: but has an error?
v_BW = im2bw (v, level); [y x] = find(v_BW); right = x<300; xr = x(right); yr = y(right); pr = polyfit( yr, xr, 3 );
yy = linspace( 1, size(v_BW,1), 50 );
figure; imshow(v_BW, 'border', 'tight' ); hold all plot( polyval( pr, yy ), yy, '*', 'LineWidth', 3 );
floorline (1, :) = floor (xr);
floorline (2, :) = floor (yr); linda cummings: cummingslinda14 at gmail com
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linda cummings cummingslinda14@gmail.com
Thank you so much. I solved the problem. I found the error.

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