# @eval in loop error
**URL:** https://discourse.julialang.org/t/eval-in-loop-error/15889
**Category:** General Usage
**Created:** [October 4, 2018, 4:25pm UTC](https://discourse.julialang.org/t/eval-in-loop-error/15889 "2018-10-04T16:25:43Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@programista](https://discourse.julialang.org/u/programista)
#### Post date: [October 4, 2018, 4:25pm UTC](https://discourse.julialang.org/t/eval-in-loop-error/15889/1 "2018-10-04T16:25:43Z")
Julia 0.7
loop like below
in row
@eval($vx=findnz(cij)[1].+(i-1)\*skok)
ERROR: UndefVarError: cij
without loop (when i=j=1 tthis line working !
var cij is local var and exist
What wrong ?
```julia
for i=1:length(zakresy).-1
for j=1:length(zakresy).-1
global x,y,z,f
drow=D[:,zakresy[i]+1:zakresy[i+1]]
dcol=D[:,zakresy[j]+1:zakresy[j+1]]
cij=drow'*dcol/k.-mean(drow,dims=1)'*mean(dcol,dims=1)#sek.
x=string("x",i,"_",j)
vx=Meta.parse(x)
@eval($vx=findnz(cij)[1].+(i-1)*skok)
end
end
```
ERROR: UndefVarError: cij not defined
Stacktrace:
[1] top-level scope at none:0
[2] eval(::Module, ::Any) at .\boot.jl:319
[3] top-level scope at util.jl:158
[4] top-level scope at REPL[51
---
### Author:  [@mauro3](https://discourse.julialang.org/u/mauro3)
#### Post date: [October 4, 2018, 5:06pm UTC](https://discourse.julialang.org/t/eval-in-loop-error/15889/2 "2018-10-04T17:06:59Z")
`cij` is only defined in the local scope of the loop but `eval` always evaluates in the global scope. Adding a `global` in front of the `cij=...` should do the trick. But IMO you should refactor your code to not need an eval.
Also, you as a veteran should know how to quote code, please do it: [PSA: how to quote code with backticks](https://discourse.julialang.org/t/psa-how-to-quote-code-with-backticks/7530)
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### Author:  [@programista](https://discourse.julialang.org/u/programista)
#### Post date: [October 4, 2018, 5:16pm UTC](https://discourse.julialang.org/t/eval-in-loop-error/15889/3 "2018-10-04T17:16:03Z")
Thanks,
IS some other way to create/named dynamicly vars in loops ?
v1
v2
v3
?
Paul
W dniu 2018-10-04 o 19:12, Mauro Werder pisze:
---
### Author:  [@mauro3](https://discourse.julialang.org/u/mauro3)
#### Post date: [October 4, 2018, 5:59pm UTC](https://discourse.julialang.org/t/eval-in-loop-error/15889/4 "2018-10-04T17:59:06Z")
No, but you could use a dict, for instance. Because if you want to access those variables of yours, you will have to do more eval-ing. This is not pretty nor performant.