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

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Akib Maghreza 2020-4-5

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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);

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Tommy 2020-4-5

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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.

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Answer 1

drummer 2020-4-5

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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