# Storing an array in CSV file
**URL:** https://discourse.julialang.org/t/storing-an-array-in-csv-file/49824
**Category:** General Usage
**Tags:** csv
**Created:** [November 9, 2020, 5:57am UTC](https://discourse.julialang.org/t/storing-an-array-in-csv-file/49824 "2020-11-09T05:57:36Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@marouane](https://discourse.julialang.org/u/marouane)
#### Post date: [November 9, 2020, 5:57am UTC](https://discourse.julialang.org/t/storing-an-array-in-csv-file/49824/1 "2020-11-09T05:57:36Z")
i’m getting confused with this simple working example, for some reason i do not get my array stored in the CSV file:
```julia
arr=[0,1]
open("out.csv","a")
CSV.write("out.csv",(arr=arr))
CSV.read("out.csv")
```
and as an output i get this:
`0 rows × 0 columns`
i am expecting the array to be stored in the file without any problems but the file is still empty .
---
### Author:  [@jules](https://discourse.julialang.org/u/jules)
#### Post date: [November 9, 2020, 8:16am UTC](https://discourse.julialang.org/t/storing-an-array-in-csv-file/49824/2 "2020-11-09T08:16:33Z")
Without having checked this, a problem could be that you’re not actually constructing a named tuple with `(arr = arr)`. This expression assigns arr to arr, just within parentheses so it almost looks like a named tuple. For one element named tuples you either have to add a comma like `(arr = arr,)` or I think `(; arr)` also works, or the more verbose `(;arr = arr)`
---
### Author:  [@marouane](https://discourse.julialang.org/u/marouane)
#### Post date: [November 10, 2020, 8:38am UTC](https://discourse.julialang.org/t/storing-an-array-in-csv-file/49824/3 "2020-11-10T08:38:59Z")
what about if i’m having more than one value to store which one of them is a scalar, something like this
```julia
for i = 0:4
beta = i*pi/4
arr=[i,i/2]
end
```
and i want to save both `beta` and `arr`
i tried this
`CSV.write(("out.csv",(all_results=all_results;beta=[beta]))`
but it didn’t work.
---
### Author:  [@jules](https://discourse.julialang.org/u/jules)
#### Post date: [November 10, 2020, 1:34pm UTC](https://discourse.julialang.org/t/storing-an-array-in-csv-file/49824/4 "2020-11-10T13:34:06Z")
That example is a bit hard to understand. Where does `all_results` come from? Your for loop overwrites `beta` and `arr` in each iteration, did you mean to collect elements?
Also, the syntax `(all_results=all_results;beta=[beta])` is not correct for a named tuple, the semicolon can only go at the beginning, but you don’t even need that. The semicolon is for this convenience syntax:
```julia
a = 1
b = 2
julia> nt = (; a, b)
(a = 1, b = 2)
```
Then you’re passing a superfluous tuple to `CSV.write`, you don’t need the extra parentheses around the two arguments.
Last but not least, if you need to store a column which only consists of the same repeated scalar, try `fill(value, number_of_elements)` to create such a vector.
---
### Author:  [@marouane](https://discourse.julialang.org/u/marouane)
#### Post date: [November 13, 2020, 11:44am UTC](https://discourse.julialang.org/t/storing-an-array-in-csv-file/49824/5 "2020-11-13T11:44:34Z")
i apologize for that `all_results` i wanted to write `arr` instead