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

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Jajang Khairil Azhar 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;
look here
always copy the entire error message, and tell us from which line of code it originated
moreover, in general, sample data would go a long way

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