I got subscript indices must be real positive integers or logicals on my code

Im trying to equalized my picture with this loop

for baris = 1 : jum_baris
    for kolom = 1 : jum_kolom
        Hasil(baris, kolom) = C(img(baris, kolom)); %this line got me that error
    end
end
Hasil = uint8(Hasil);

[Tommy]

What is C? It is likely that

img(baris, kolom)

is the culprit. If C is a matrix, the above statement should return a real positive integer or logical.

Answer 1

[drummer]

What is C?

I suppose your original image to be equalized is img. So is C any function applied in img?

If that's not the case, your just playing with the indexes.

Previously to your code, you can say the height and width of img.

[jum_baris, jum_kolon] = size(img);

That way, jum_baris and jum_kolom will be integers and positives. if you're taking them elsewhere, and they have decimal places, using them as indexes for matrix won't work.

yourNewMatrix(1.3, 1.12) % is not possible.

If they go randomly between positive and negative numbers, they won't work as well

yourMatrix(1,-2) % is not possible as well.

Cheers

Answer 2

[Image Analyst]

This is a FAQ (possibly the most F or the error message questions), so see the FAQ:

https://matlab.fandom.com/wiki/FAQ#.22Subscript_indices_must_either_be_real_positive_integers_or_logicals..22

It has a pretty thorough discussion.