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Help me about my error on index in position 2 exceeds array bounds (must not exceed 800).

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Jajang Khairil Azhar
Jajang Khairil Azhar on 22 Dec 2019
Answered: TADA on 22 Dec 2019
after=before; %Inisialisasi matriks hasil untuk memuat tanda air
for i=1:rm %Sematkan watermark di mid-band
for j=1:cm
x=(i-1)*8;
y=(j-1)*8;
if mark(i,j)==1
k=k1;
else
k=k2;
end;
after(x+1,y+8)=before(x+1,y+8)+alpha*k(1);
after(x+2,y+7)=before(x+2,y+7)+alpha*k(2);
after(x+3,y+6)=before(x+3,y+6)+alpha*k(3);
after(x+4,y+5)=before(x+4,y+5)+alpha*k(4);
after(x+5,y+4)=before(x+5,y+4)+alpha*k(5);
after(x+6,y+3)=before(x+6,y+3)+alpha*k(6);
after(x+7,y+2)=before(x+7,y+2)+alpha*k(7);
after(x+8,y+1)=before(x+8,y+1)+alpha*k(8);
end;
end;

  2 Comments

Walter Roberson
Walter Roberson on 22 Dec 2019
My guess is that (cm-1)*8+8 == 8*cm exceeds the number of columns in before .
But that is only a guess, as we do not know the size(before) or what the values of rm or cm are.

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Answers (1)

TADA
TADA on 22 Dec 2019
I have no idea what rm and cm are, but at some iteration
y=(j-1)*8 + 8
is greater than the number of columns in your matrix
under the editor menu, you have the run button, if you expand the run menu you can check the "pause on errors"
to easily debug this error

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