Tables

Tables are coordinates in a tabular format (essentially a matrix), optionally with named columns. They have various constructors, for direct construction and also for conversion from other types.

Unnamed columns

Let

x = linspace(0, 2*pi, 100)
y = sin.(x)

You can pass these coordinates in unnamed columns:

Plot(Table([x, y]))

[.pdf], [generated .tex]

Named columns

Or named columns:

Plot(Table([:x => x, :y => y]))

[.pdf], [generated .tex]

Rename options

The columns can be renamed using options:

@pgf Plot(
    {
        x = "a",
        y = "b",
    },
    Table([:a => x, :b => y]))

[.pdf], [generated .tex]

Excluding points

In the example below, we use a matrix of values with edge vectors, and omit the points outside the unit circle:

x = linspace(-1, 1, 20)
z = @. 1 - √(abs2(x) + abs2(x'))
z[z .≤ 0] .= -Inf
@pgf Axis(
    {
        colorbar,
        "colormap/jet",
        "unbounded coords" = "jump"
    },
    Plot3(
        {
            surf,
            shader = "flat",
        },
        Table(x, x, z)
    )
)

[.pdf], [generated .tex]

Quiver plot

A quiver plot can be created as:

x = -2pi:0.2:2*pi
y = sin.(x)

u = ones(length(x))
v = cos.(x)

@pgf Axis(
    {
        title = "Quiver plot"
        grid = "both"
    },
    Plot(
        {
            quiver = {u = "\\thisrow{u}", v = "\\thisrow{v}"},
            "-stealth"
        },
        Table(x = x, y = y, u = u, v = v)
    ),
    LegendEntry("\$\\cos(x)\$"),
    Plot(
        {
            color = "red",
            very_thick
        },
        Coordinates(x, y)
    ),
    LegendEntry("\$\\sin(x)\$")
)

[.pdf], [generated .tex]