Fill between lines

Syntax

The relevant commands here are

• fill_between and fill_between!,

and the syntax is:

command(x, y1, y2; options...)

where

• x must be a vector of values or a range of values,
• y1 and y2 can either be a real value (horizontal line) or a vector of values of length matching x.

For instance:

x = range(0, stop=π, length=100)
y1 = 0
y2 = @. cos(5x)*exp(-x)
plot(x, y2, lw=0.05)
fill_between!(x, y1, y2, fill="aliceblue")
hline(y1)
xlim(0, π)

Styling options

• from/to [from, min, xmin // to, max, xmax]: takes a number indicating one or both vertical limits for the fill.

x = range(0, stop=π, length=100)
y1 = 0
y2 = @. cos(5x)*exp(-x)
plot(x, y2, lw=0.05)
fill_between!(x, y1, y2, fill="salmon", from=π/5, to=3π/5)
hline(y1)
xlim(0, π)

• fill colour [col, color, fill]: takes a colour to use for the filling (see examples above).

• alpha [alpha]: when considering a transparent-capable output format, this takes a number between 0 and 1 indicating the level of transparency (towards 0 is more transparent, towards 1 more opaque).

x = range(0, stop=1, length=100)
y = x.^2
fill_between(x, y, x; color="orchid", alpha=0.2)
fill_between!(x, 0.5, 0.6; from=0.4, to=0.9, alpha=0.2)
style = (color="darkslategray", ls="--", lw=0.01)
hline(0.5; style...)
hline(0.6; style...)
vline(0.4; style...)
vline(0.9; style...)