# Longitudinal data plotting
**URL:** https://discourse.julialang.org/t/longitudinal-data-plotting/105629
**Category:** New to Julia
**Tags:** plots
**Created:** [October 31, 2023, 7:01pm UTC](https://discourse.julialang.org/t/longitudinal-data-plotting/105629 "2023-10-31T19:01:30Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Huputus](https://discourse.julialang.org/u/Huputus)
#### Post date: [October 31, 2023, 7:01pm UTC](https://discourse.julialang.org/t/longitudinal-data-plotting/105629/1 "2023-10-31T19:01:30Z")
Hello people,
I’m trying to plot longitudinal data that includes columns “ID”, “Time” and “Weight”. When I try to plot it with command plot(df.Time, df.Weight) it creates one line that goes back and forth. So how I can split the legends by ID?
Example image with zigzag lines:
Here is code to generate the problem:
```julia
using DataFrames
using Random
using Statistics
using Distributions
using Plots
n = 50
left_ratio = 5; right_ratio = convert(Int, n * 1/left_ratio)
ID = repeat(1:right_ratio,inner=left_ratio)
Time = repeat(1:left_ratio, outer=right_ratio)
beta0 = 5; beta1 = 2
error = 10
b0_random_effect_variance= 10
b0_random_effect = repeat(rand(Normal(0, sqrt(b0_random_effect_variance)),right_ratio),inner=left_ratio)
y = (beta0 .+ b0_random_effect) .+ (beta1 .* Time) .+ rand(Normal(0, sqrt(error)), n)
full_df = DataFrame(ID=ID, Time=Time, Weight=y)
plot(full_df.Time, full_df.Weight)
```
---
### Author:  [@Huputus](https://discourse.julialang.org/u/Huputus)
#### Post date: [October 31, 2023, 7:56pm UTC](https://discourse.julialang.org/t/longitudinal-data-plotting/105629/2 "2023-10-31T19:56:26Z")
Oh my god.
I solved my own problem by following Julia forums sophisticated recommendations.
```julia
plot(full_df.Weight, group=full_df.Time)
```
Does this mean I have to move to live rest of my life in exilement or should I remove the post?
---
### Author:  [@Huputus](https://discourse.julialang.org/u/Huputus)
#### Post date: [October 31, 2023, 8:08pm UTC](https://discourse.julialang.org/t/longitudinal-data-plotting/105629/3 "2023-10-31T20:08:27Z")
Ok, that didn’t solve my problem. Because it groups by Time (like the code says). When I use “plot(full\_df.Weight, group=full\_df.ID)”
It prints like this:
:
---
### Author:  [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)
#### Post date: [October 31, 2023, 8:27pm UTC](https://discourse.julialang.org/t/longitudinal-data-plotting/105629/4 "2023-10-31T20:27:16Z")
Why not:
```julia
plot(full_df.Time, full_df.Weight, group=full_df.ID)
```
---
### Author:  [@Huputus](https://discourse.julialang.org/u/Huputus)
#### Post date: [October 31, 2023, 8:36pm UTC](https://discourse.julialang.org/t/longitudinal-data-plotting/105629/5 "2023-10-31T20:36:27Z")
Interesting. That solved my problem. Thanks!
I tried that at one point but maybe my DataFrame had problems at that point or something.
---
### Author:  [@Huputus](https://discourse.julialang.org/u/Huputus)
#### Post date: [October 31, 2023, 8:45pm UTC](https://discourse.julialang.org/t/longitudinal-data-plotting/105629/7 "2023-10-31T20:45:10Z")
Longitudinal because the data is “long format”. I could have used other more common terms but I hope people interested in longitudinal data analysis could find my post in the future.