Index exceeds matrix dimensions while using a for loop

I tried to make a simple program to find a specific set of numbers, but when I run it, it says "Index exceeds matrix dimensions". The line that causes an issue is "if(r(i+1)==2)"

does anyone know what the problem could be? I don't see it. r is a 10000x1 matrix, so I believe the dimensions are alright.

 x=0
 while (x==0)

    n=10000

 r = randi([0 9],n,1);

    for i=1:n
        if(r(i)==1)
            if(r(i+1)==2)
                if(r(i+2)==3)
                    if(r(i+3)==4)
                        if(r(i+4)==5)
                            if(r(i+5)==6)
                                if(r(i+6)==7)
                                    if(r(i+7)==8)
                                        if(r(i+8)==9)
                                            display('found')
                                            display(i)
                                            x=1
                                        end
                                    end
                                end
                            end
                        end
                    end
                end
            end
        end
    end
end

Answer 1

[bio lim]

You defined your variable r as:

   n=10000
   r = randi([0 9],n,1);

So now, your r is 10000x1 double.

Then you defined a loop

for i=1:n

So i will go from 1 to 10000. What happens when i reaches to, let's say 10000?

if(r(i+1)==2)

The above is asking if the 10001 element of r is equal to 2, but the dimension of your r is 10000x1. Hence the error occurs.

[Jeroen Bouma]

Thank you!