3D scatter plot in Julia

Question

Working in Julia and using Plots, I have an array of points that lie on two distinct surfaces. The points are mixed together such that doing a surface plot looks like garbage, because it tries to connect points on the two surfaces. I think the best way to get around this is to plot the points simply as dots in space.

How do I plot points in 3D without connecting them by a surface?

There are many ways to do this. Does this [previous SO answer](https://stackoverflow.com/a/38848173/1409374) help? — rickhg12hs, Jan 30 '19 at 06:04

score 6 · Answer 1 · answered Jan 31 '19 at 22:54

6

You can use scatter from Plots.

Just pass the coordinates of points as 3 arrays to scatter function

X = [x1, x2, x3]
Y = [y1, y2, y3]
Z = [z1, z2, z3]

scatter(X, Y, Z)

answered Jan 31 '19 at 22:54

Uziel Linares

98
5

score 2 · Answer 2 · answered Jan 30 '19 at 06:45

Using Plots:

plt3d= Plots.plot(points[1,:],points[2,:], points[3,:],
     seriestype=:scatter, markersize = 7)
display(plt3d)

In the above, I assume the points are in a 3x<num_of_points> array. Also increased the marker size, as the 3d plots default is small.

score 1 · Answer 3 · answered Jan 28 '22 at 15:39

For an interactive plot, you can use PlotlyJS:

using PlotlyJS, CSV, DataFrames
df = dataset(DataFrame, "iris")
plot(
    df,
    x=:sepal_length, y=:sepal_width, z=:petal_width, color=:species,
    type="scatter3d", mode="markers"
)

source: https://plotly.com/julia/3d-scatter-plots/

3D scatter plot in Julia

3 Answers3