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Data Science Applications to Astronomy

Week 10: Data Visualization:

Q&A

Plots

Question:

We saw a table of 15 fonts to write “phi,” is there a font for greek letters that’s used most often in figures or papers?

using LaTeXStrings
L"$\phi"
begin
    n = 50
    x = rand(n)
    y = 4 .* x + randn(n)
end;
scatter(x,y, xlabel="Unicode: Φ or ϕ", ylabel=L"\mathrm{LaTeX:}\;\; \Phi \; or\; \phi", legend=:none)
Question:

For the scatter plot in the lab this week, how could we have made the points partly transparent?

scatter(x,y, alpha=0.5)
scatter(x,y, alpha=plt_α, markerstrokewidth=0)

Transparency ("alpha"):

Question:

Is there another type of plot to show the density of data that is not a contour plot?

let
    m = 40
    z = randn(n,m)
    z = (1:n)' * 1 .+ 0.5.* randn(m)
    heatmap(1:n, 1:m, z,
    c=:diverging_bwr_20_95_c54_n256,
    xlabel="x", ylabel="y",
    title="Heatmap")
end
Question:

Are there certain colors/combination of colors that should be avoided when presenting visuals?

Color pairs hard for people with CVD

  • Red & Green (most common)

  • Blue & Green and Yellow & Red

Just look bad (very subjective)

  • Yellow & Green

  • Brown & Orange

  • Multiple neon colors

Hard to distinguish

  • Yellow & Orange

  • Black & Navy blue

Cross validation

question_box(md"Can you explain k-fold again please?")
Question:

Can you explain k-fold again please?

K in K-fold Validation:

Setup

Built with Julia 1.11.5 and

ColorSchemes 3.29.0
LaTeXStrings 1.4.0
MLUtils 0.4.7
Plots 1.40.9
PlutoTeachingTools 0.3.1
PlutoUI 0.7.61

To run this tutorial locally, download this file and open it with Pluto.jl.