MATLAB: Subscript indices must either be real positive integers or logicals.

Question

Hi,

   dist = sqrt((r1 - r2) ^ 2 + (c1 - c2) ^ 2);
   costs(i) = 1 /ceil( dist) * exp(- abs(ceil(img(abs(r1), abs(c1))) - ceil(img(abs(r2),abs(c2)))) ^ 2 / (2 * sigma ^ 2));

c2 is equal to 0 ,so it returns Subscript indices must either be real positive integers or logicals.

Thanks

Answer 1

faq: http://matlab.wikia.com/wiki/FAQ#How_do_I_fix_the_error_.22Subscript_indices_must_either_be_real_positive_integers_or_logicals..22.3F

If c2 is zero, img(abs(r2), 0) won't work. Make sure it's not zero.