# An unexpected result using DataFrames.jl
**URL:** https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249
**Category:** New to Julia
**Tags:** dataframes
**Created:** [May 10, 2020, 10:55pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249 "2020-05-10T22:55:32Z")
**Posts on this page:** 13
**Page:** 1
### Author:  [@ameresv](https://discourse.julialang.org/u/ameresv)
#### Post date: [May 10, 2020, 10:55pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/1 "2020-05-10T22:55:32Z")
Hi! Following JuliaAcademy, I had found something that results confusing.
```julia
using DataFrames, Random
function sim_e()
draw = Float64[]
while true
push!(draw, rand())
sum(draw) > 1.0 && return draw
end
end
Random.seed!(1234);
res = [sim_e() for _ in 1:5]
sum.(res)
@. sum(res) - last(res)
df = DataFrame()
@time for i in 1:10^7
push!(df, (id=i, pos=sim_e()))
end
df
transform!(df, :pos => ByRow(length) => :jumps)
```
This code has to deliver the following, according to the tutorial:
However, I obtain this error message:
Which is nonsense considering that I have been using DataFrames.jl during the course.
Did I do something wrong?
Regards
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [May 11, 2020, 6:09am UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/2 "2020-05-11T06:09:50Z")
Works for me - are you sure you’re on the latest version of DataFrames?
---
### Author:  [@ameresv](https://discourse.julialang.org/u/ameresv)
#### Post date: [May 11, 2020, 5:29pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/3 "2020-05-11T17:29:53Z")
I am using DataFrames v0.20.2.
---
### Author:  [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)
#### Post date: [May 11, 2020, 5:30pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/4 "2020-05-11T17:30:53Z")
Can you run `import Pkg; Pkg.update()`? The latest version is `v0.21.0`. All those fun things are defined only for the newest version of DataFrames.
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [May 11, 2020, 5:46pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/5 "2020-05-11T17:46:30Z")
Don’t think that will work given the output of `pkg> up` above - something might be holding you back, try `add DataFrames@0.21` to see what’s restricting the DataFrames version.
---
### Author:  [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)
#### Post date: [May 11, 2020, 5:48pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/6 "2020-05-11T17:48:46Z")
good call. OP should probably start their own environment for the julia academy tutorial. but that’s a bit scary for a new comer. This is unfortunate.
---
### Author:  [@js135005](https://discourse.julialang.org/u/js135005)
#### Post date: [May 11, 2020, 5:49pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/7 "2020-05-11T17:49:18Z")
If you use ODBC, that holds DataFrames back at v0.20.2 at the moment.
---
### Author:  [@ameresv](https://discourse.julialang.org/u/ameresv)
#### Post date: [May 11, 2020, 5:54pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/8 "2020-05-11T17:54:16Z")
Hi! Thanks for your answer. Following your suggestion, this message appears:
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [May 11, 2020, 5:56pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/9 "2020-05-11T17:56:07Z")
Okay so you can do `]rm MLJ` to remove MLJ (if you don’t need it now!) - MLJ currently restricts compatibility to DataFrames below 0.21 so won’t let you update.
---
### Author:  [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)
#### Post date: [May 11, 2020, 6:05pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/10 "2020-05-11T18:05:55Z")
OP, the way to really avoid this problem is to create a new folder and use julia to `cd` into it. Then run `import Pkg; Pkg.activate(".")`.
After that, add all the packages you need to get through the JuliaAcademy course.
So something like this, which you only need to run once.
```julia
import Pkg
mkdir("JuliaAcademyCourse")
cd("JuliaAcademyCourse")
Pkg.activate(".")
Pkg.add("DataFrames")
# add other packages
```
Then if you close and re-open your julia terminal, you just need to do set Julia to the folder above and run `import Pkg; Pkg.activate(".")`.
If this is too complicated, don’t worry about it. You can just focus on removing `MLJ` like the poster above mentioned and trying to update DataFrames again.
---
### Author:  [@ameresv](https://discourse.julialang.org/u/ameresv)
#### Post date: [May 11, 2020, 6:57pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/11 "2020-05-11T18:57:35Z")
Thanks for your support. The problem looks fixed. The downside is that now appears these messages that I encountered a bit difficult to understand by the time to using Statistics and GLM.
What does it mean?
---
### Author:  [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)
#### Post date: [May 11, 2020, 8:17pm UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/12 "2020-05-11T20:17:42Z")
These should all be fine as long as the code works. I couldn’t explain what all of them mean, though.
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [May 12, 2020, 6:08am UTC](https://discourse.julialang.org/t/an-unexpected-result-using-dataframes-jl/39249/13 "2020-05-12T06:08:52Z")
They shouldn’t worry you - and also they should go away once you restart Julia.