# Dictionary
**URL:** https://discourse.julialang.org/t/dictionary/46711
**Category:** General Usage
**Tags:** dictionary
**Created:** [September 16, 2020, 3:02pm UTC](https://discourse.julialang.org/t/dictionary/46711 "2020-09-16T15:02:24Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@mmyousefies](https://discourse.julialang.org/u/mmyousefies)
#### Post date: [September 16, 2020, 3:02pm UTC](https://discourse.julialang.org/t/dictionary/46711/1 "2020-09-16T15:02:24Z")
hello, I’m new to Julia, and here’s my problem:
using RDatasets, I wanted to make a dictionary of the first 2columns of the “iris” data frame; here’s how I did it:
> using RDataets
> IRIS = dataset(“datasets”,“iris”)
> j = Dict()
> for i in 1:length(IRIS[!,1])
> j[IRIS[i,1]]=IRIS[i,2]
> end
> but given that number of the entries must be 150 (there are150 rows in “iris” dataset), the dicitonary has only 35 entries:
> julia\> j
> Dict{Any,Any} with 35 entries:
> 5.5 =\> 2.6
> 4.3 =\> 3.0
> 6.5 =\> 3.0
> 7.7 =\> 3.0
> 4.5 =\> 2.3
> 5.9 =\> 3.0
> 7.1 =\> 3.0
> 7.0 =\> 3.2
> 7.4 =\> 2.8
> 4.4 =\> 3.2
> 5.7 =\> 2.5
> 6.7 =\> 3.0
> 6.2 =\> 3.4
> 4.7 =\> 3.2
> 6.4 =\> 3.1
> 6.6 =\> 3.0
> 6.0 =\> 3.0
> 4.6 =\> 3.2
> 6.1 =\> 2.6
> 6.8 =\> 3.2
> 6.3 =\> 2.5
> 5.8 =\> 2.7
> 6.9 =\> 3.1
> 5.1 =\> 2.5
> 5.2 =\> 2.7
> 5.3 =\> 3.7
> 7.6 =\> 3.0
> 4.8 =\> 3.0
> 5.0 =\> 2.3
> 5.6 =\> 2.8
> 7.3 =\> 2.9
> 4.9 =\> 2.5
> 7.2 =\> 3.0
> 5.4 =\> 3.0
> 7.9 =\> 3.8
what did i do wrong? thank you.
---
### Author:  [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)
#### Post date: [September 16, 2020, 3:11pm UTC](https://discourse.julialang.org/t/dictionary/46711/2 "2020-09-16T15:11:28Z")
The first column of `IRIS` only has 35 unique values. Consequently, you are overwriting values in the `Dict` as you assign them.
See the following
```julia
julia> d = Dict();
julia> d["a"] = 1
1
julia> d["a"] = 2
2
julia> d
Dict{Any,Any} with 1 entry:
"a" => 2
```
---
### Author:  [@mmyousefies](https://discourse.julialang.org/u/mmyousefies)
#### Post date: [September 16, 2020, 4:23pm UTC](https://discourse.julialang.org/t/dictionary/46711/3 "2020-09-16T16:23:11Z")
wow! thankyou! I appreciate it.