So at REPL I typed the following

```
julia> using Polynomials
julia> p=Poly([5,-3,-2,-2,1,1])
Poly(5 - 3*x - 2*x^2 - 2*x^3 + x^4 + x^5)
julia> dp=polyder(p)
Poly(-3 - 4*x - 6*x^2 + 4*x^3 + 5*x^4)
julia> function newtonIteration(p,dp,x)
return x-p(x)/dp(x)
end
newtonIteration (generic function with 1 method)
julia> x=2
2
julia> x = newtonIteration(p,dp,x)
1.7012987012987013
julia> for i in 1:10
print(x)
x = newtonIteration(p,dp,x)
end
ERROR: UndefVarError: x not defined
Stacktrace:
[1] top-level scope at .\REPL[7]:2
```

I really don’t understand what has gone wrong here. Does `for`

live in a different namespace. What is happening?

By the way, I know that the Newton method has already been implemented, I am just interested at the bug I get in this case.