would you please help me why `i`

cant be known inside this while as following in julia v1+?

```
W=([1.0825998948767477 9.448347129060197 972.5335271289529; 165.861582812015 4.563134610834678 1.0293311999771995], 0)
i=1;
k=size(W[1],2);
while i < k
if ((abs(round(W[1][1,i],digits=6)-round(W[1][1,i+1],digits=6))>2) && (abs(round(W[1][2,i],digits=6)-round(W[1][2,i+1],digits=6))>2))
p=[(W[1][:,i],W[1][:,i+1],"T",pq[4])];
PQ=[PQ;p];
end
if ~(i==1)
if ((W[1][:,i],1) != (W[1][:,i+1],1))
list=[(W[1][:,i],0)];
end
List=[List;list];
end
i=i+1;
end
```

this error happened

```
UndefVarError: i not defined
top-level scope at untitled-867f699d493f5b9bf0774f2429eafd0e:5
include_string(::Function, ::Module, ::String, ::String) at loading.jl:1088
```

Thanks indeed.