# TimeSeries.jl package, some information missing from documentation
**URL:** https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485
**Category:** New to Julia
**Tags:** question
**Created:** [February 11, 2023, 11:57pm UTC](https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485 "2023-02-11T23:57:24Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@vsoler](https://discourse.julialang.org/u/vsoler)
#### Post date: [February 11, 2023, 11:57pm UTC](https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485/1 "2023-02-11T23:57:24Z")
I’m studying the TimeSeries Package, which I find very useful.
However, I find that some information is missing from the documentation:
1. the section on “Mathematical, comparison, and logical operators” does not include any examples
2. I’ve been able to create a new TimeSeries Array by combining 2 different columns
```julia
ta[:, :col1] .+ ta[:, :col3]
```
1. The result, however, is a new TimeSeries Array, that I can save.
```julia
ta2 = ta[:, :col1] .+ ta[:, :col3]
```
1. I I want the result of my calculation added to my original Array, I need to execute a hcat
```julia
ta3 = hcat(ta, ta2)
```
1. However, instead of creating a new TimeSeries Array, I would like to create directly an additional column, with something similar to:
```julia
ta[!, :col4] .= ta[:, :col1] .+ ta[:, :col3]
```
… which does not work
Am I doing something wrong?
---
### Author:  [@tom-plaa](https://discourse.julialang.org/u/tom-plaa)
#### Post date: [February 28, 2023, 12:21pm UTC](https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485/2 "2023-02-28T12:21:41Z")
I haven’t tried this myself using TimeSeriesArrays, but if you want to modify an existing array, you can just overwrite it:
```julia
ta = hcat(ta, ta2)
```
On standard Arrays:
```julia
julia> a = rand(3); b = rand(3)
3-element Vector{Float64}:
0.9536106574209692
0.7989128765471554
0.43802663511779616
julia> a = hcat(a,b)
3×2 Matrix{Float64}:
0.540416 0.953611
0.403237 0.798913
0.601049 0.438027
julia> a
3×2 Matrix{Float64}:
0.540416 0.953611
0.403237 0.798913
0.601049 0.438027
```
---
### Author:  [@mdogan](https://discourse.julialang.org/u/mdogan)
#### Post date: [February 28, 2023, 2:51pm UTC](https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485/3 "2023-02-28T14:51:05Z")
I suggest using **TSFrames** package instead for time series data. TimeSeries is unmaintained.
Please see:
>
>
> I noticed that the last commit is from January and that there are lot's of open …and unanswered issues as well as open PRs. So I was wondering if \`TimeSeries.jl\` is still maintained?
---
### Author:  [@vsoler](https://discourse.julialang.org/u/vsoler)
#### Post date: [March 9, 2023, 11:38am UTC](https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485/4 "2023-03-09T11:38:25Z")
@mdogan
TSFrames does not install in my PC
```julia
(@v1.8) pkg> add TSFrames
Resolving package versions...
ERROR: TOML Parser error:
C:\Users\USUARIO\.julia\registries\General\R/Rotations\Versions.toml:1:1 error: invalid bare key character: '\0'
```
It seems to me that there is an error in the package.
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [March 9, 2023, 11:42am UTC](https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485/5 "2023-03-09T11:42:29Z")
Works fine for me, this looks more like your registry is corrupted, try `]registry rm General` and `]registry add General`
---
### Author:  [@mdogan](https://discourse.julialang.org/u/mdogan)
#### Post date: [March 9, 2023, 11:44am UTC](https://discourse.julialang.org/t/timeseries-jl-package-some-information-missing-from-documentation/94485/6 "2023-03-09T11:44:44Z")
For me also looks fine. I can install it.