How is curve fitting in image processing?

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

[John D'Errico]

When you claim something has an error in it, provide the error message! Paste in the entire text of the error. We cannot replicate your error, since we don't have those variables to run your code.

[linda cummings [e-mail]]

Thank you so much. I solved the problem. I found the error.