# Is it possible to make conditional changes in a TimeArray (TimeSeries) object entries?
**URL:** https://discourse.julialang.org/t/is-it-possible-to-make-conditional-changes-in-a-timearray-timeseries-object-entries/61231
**Category:** New to Julia
**Tags:** module, time-series
**Created:** [May 16, 2021, 7:15am UTC](https://discourse.julialang.org/t/is-it-possible-to-make-conditional-changes-in-a-timearray-timeseries-object-entries/61231 "2021-05-16T07:15:19Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@shubh\_b](https://discourse.julialang.org/u/shubh_b)
#### Post date: [May 16, 2021, 7:15am UTC](https://discourse.julialang.org/t/is-it-possible-to-make-conditional-changes-in-a-timearray-timeseries-object-entries/61231/1 "2021-05-16T07:15:19Z")
Here is a `TimeArray` object `ta` as
```julia
using TimeSeries
dt = [Date("2011-12-07"), Date("2012-04-06"), Date("2012-07-07")]
par1 = [11, 12, 14]
par2 = [21, 22, 24]
ta = TimeArray((dt = dt, par1 = par1, par2 = par2), timestamp = :dt)
ta
│ │ par1 │ par2 │
├────────────┼───────┼───────┤
│ 2011-12-07 │ 11 │ 21 │
│ 2012-04-06 │ 12 │ 22 │
│ 2012-07-07 │ 14 │ 24 │
```
In `timestamp` column, there are 2 `Sunday`s and 1 `Saturday` here. If I try to change the entry `12` for `Saturday` in `par1` column to `112`:
```julia
julia> values(ta[day.(timestamp(ta)) .== Sat])[1, 1]
12
julia> values(ta[day.(timestamp(ta)) .== Sat])[1, 1] = 112
112
```
It does not change the entry in `ta`. `ta` remains same:
```julia
julia> ta
│ │ par1 │ par2 │
├────────────┼───────┼───────┤
│ 2011-12-07 │ 11 │ 21 │
│ 2012-04-06 │ 12 │ 22 │
│ 2012-07-07 │ 14 │ 24 │
```
Is there a way to perform any operation to do conditional changes in `TimeArray` entries?
---
### Author:  [@Skoffer](https://discourse.julialang.org/u/Skoffer)
#### Post date: [May 16, 2021, 11:16am UTC](https://discourse.julialang.org/t/is-it-possible-to-make-conditional-changes-in-a-timearray-timeseries-object-entries/61231/2 "2021-05-16T11:16:26Z")
The problem is that `ta[day.(timestamp(ta)) .== Sat]` creates new `TimeArray` object, which is a copy of the original. That is why changes in this object is not reflected in the original `ta`. There is an old [issue](https://github.com/JuliaStats/TimeSeries.jl/issues/419), probably when it is resolved you will be able syntax shown in your example.
Currently, you can do something like this
```julia
julia> @view(values(ta)[day.(timestamp(ta)) .== Sat, :])[1, 1] = 112;
julia> ta
3×2 TimeArray{Int64, 2, Date, Matrix{Int64}} 2011-12-07 to 2012-07-07
│ │ par1 │ par2 │
├────────────┼───────┼───────┤
│ 2011-12-07 │ 11 │ 21 │
│ 2012-04-06 │ 112 │ 22 │
│ 2012-07-07 │ 14 │ 24 │
```
---
### Author:  [@shubh\_b](https://discourse.julialang.org/u/shubh_b)
#### Post date: [May 16, 2021, 12:17pm UTC](https://discourse.julialang.org/t/is-it-possible-to-make-conditional-changes-in-a-timearray-timeseries-object-entries/61231/3 "2021-05-16T12:17:34Z")
@Skoffer Thank you for this info. 🙂