Hi everyone. I have a simple doubt about whether is possible to have an index number inside a function in a for loop. The ilustrative example below makes my doubt clearer.

I have an affine function `f(x) = 2x - a`

and I want to find the root for distinct values of a. In this case, is it possible to use the `fzero`

function inside a loop?

I understand why the error occurs but I do not know how to fix it. I have a similar code in *Fortran* and I am trying to convert it to Julia.

Thanks a lot!

```
a = [1 3 5]
function main(x)
2*x - a[i]
end # function
guess = 5
for i in 1:3
y = fzero(main, guess)
println(y)
end # for
UndefVarError: j not defined
```