# Makie - Weird error with Observables

**URL:** https://discourse.julialang.org/t/makie-weird-error-with-observables/57960
**Category:** Visualization
**Tags:** makie
**Created:** [March 25, 2021, 6:21pm UTC](https://discourse.julialang.org/t/makie-weird-error-with-observables/57960 "2021-03-25T18:21:15Z")
**Posts on this page:** 1
**Showing post:** 4

<div class="post-metadata">

### Author: ![nandoconde](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nandoconde/32/19497_2.png) [@nandoconde](https://discourse.julialang.org/u/nandoconde)
#### Post date: [March 26, 2021, 10:07am UTC](https://discourse.julialang.org/t/makie-weird-error-with-observables/57960/4 "2021-03-26T10:07:49Z")

</div>

Sorry, I thought the code above was clear enough to guess the rest of the variables.  
Here is the state of my packages:

```nohighlight
(@v1.6) pkg> st GLMakie
      Status `~\.julia\environments\v1.6\Project.toml`
  [e9467ef8] GLMakie v0.1.27

(@v1.6) pkg> st Colors
      Status `~\.julia\environments\v1.6\Project.toml`
  [5ae59095] Colors v0.12.6

```

And here is a full MWE:

> **Summary**
>
> ```julia
> # Load packages
> using GLMakie, Colors
> 
> # Data
> freqs = range(5e8, 4.5e10, length = 1001);
> lr = range(0.01, 2π, length = 1001);
> S = Array{Complex,3}(undef, 1001, 3, 25);
> for i = 1:25
> S[:,1,i] = @. (50 - 50*exp(im*lr*i/12))/(50 + 50*exp(im*lr*i/12))
> S[:,2,i] = @. (50 - 75*exp(im*lr*i/12))/(50 + 75*exp(im*lr*i/12))
> S[:,3,i] = @. (50 - 35*exp(im*lr*i/12))/(50 + 35*exp(im*lr*i/12))
> end
> 
> # Figure
> titles = ["S₁₁","S₁₂","S₂₂"]
> res = (1920*0.9, 1080*0.5) # Pixel size
> fig = Figure(resolution = res)
> for i = 1:3
> fig[1,i] = Axis(fig,
> title = titles[i],
> xminorticksvisible = true,
> yminorticksvisible = true,
> xminorgridvisible = true,
> yminorgridvisible = true,
> xminorticks = IntervalsBetween(4),
> yminorticks = IntervalsBetween(4),
> xlabel = "f [GHz]",
> ylabel = "dB")
> end
> linkaxes!(contents(fig[1,1])[1], contents(fig[1,2])[1], contents(fig[1,3])[1])
> ylims!(contents(fig[1,1])[1], (-50, 0))
> fig[0,:] = Label(fig, "Default title", textsize = 30)
> 
> # Interactivity
> fig[3,:] = Slider(fig, range = 1:25, startvalue = 1)
> p = contents(fig[3,:])[1].value
> toggle = Toggle(fig, active = true)
> 
> # Create labels (static)
> lin_label = Label(fig, "lin")
> dB_label = Label(fig, "dB")
> 
> # Display labels and toggle
> fig[2,4] = grid!(hcat(lin_label,toggle,dB_label), tellheight = false)
> 
> # Try to plot figures
> labels = ["CST","CST","CST"]
> colores = [RGB(0.85, 0.325, 0.098), RGB(0, 0.447, 0.741)]
> indices = [CartesianIndex(1,1),CartesianIndex(1,2),CartesianIndex(2,2)]
> dB = x -> (20*log10(abs(x)))
> for i in 1:3
> lines!(fig[2,i], 
> freqs, 
> dB.(S[:,i,1]),
> label = labels[i],
> ylabel = "dB",
> color = colores)
> end
> 
> ```

---

_[View the full topic](https://discourse.julialang.org/t/makie-weird-error-with-observables/57960)._