# Problem with a variable
**URL:** https://discourse.julialang.org/t/problem-with-a-variable/24954
**Category:** Performance
**Created:** [June 5, 2019, 10:03am UTC](https://discourse.julialang.org/t/problem-with-a-variable/24954 "2019-06-05T10:03:47Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@opihor](https://discourse.julialang.org/u/opihor)
#### Post date: [June 5, 2019, 10:03am UTC](https://discourse.julialang.org/t/problem-with-a-variable/24954/1 "2019-06-05T10:03:47Z")
Why this code doesn’t work ? I have the error : maxL not defined
"
maxL=0
for j in 1:size(jobs\_in\_file,1)
if ((ordered\_jobs[j].start\_time + ordered\_jobs[j].proc) \> ordered\_jobs[j].due)
maxl1 = maxL + 0
maxL = max(ordered\_jobs[j].start\_time + ordered\_jobs[j].proc - ordered\_jobs[j].due, maxL)
end
end
"
Thanks for the help!
---
### Author:  [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)
#### Post date: [June 5, 2019, 10:10am UTC](https://discourse.julialang.org/t/problem-with-a-variable/24954/2 "2019-06-05T10:10:54Z")
`for` introduces a new local scope, see [Scope of Variables · The Julia Language](https://docs.julialang.org/en/v1/manual/variables-and-scoping/). See [for loop - Scope of variables in Julia - Stack Overflow](https://stackoverflow.com/questions/51930537/scope-of-variables-in-julia) for some more discussion and solutions.
See also [PSA: how to quote code with backticks](https://discourse.julialang.org/t/psa-how-to-quote-code-with-backticks/7530)
---
### Author:  [@dburch](https://discourse.julialang.org/u/dburch)
#### Post date: [June 5, 2019, 2:17pm UTC](https://discourse.julialang.org/t/problem-with-a-variable/24954/4 "2019-06-05T14:17:09Z")
You could wrap the code in a let…end block. This would put `maxL` in scope.
```julia
let
[your code here]
end
```