When working with plots in Julia, the vline function is used to draw vertical lines on a plot. The syntax for vline in plots jl is as follows:
using Plots
plot(x, y)
vline!(x, args...)
Option 1: Using vline! function
The vline! function is a convenient way to add vertical lines to a plot. It takes the x-coordinates of the lines as the first argument, followed by optional arguments to customize the appearance of the lines.
Here is an example:
using Plots
x = 1:10
y = rand(10)
plot(x, y)
vline!([5, 8], line=:dash, color=:red)
This code will create a plot with random y-values and draw vertical dashed red lines at x-coordinates 5 and 8.
Option 2: Using vline function
If you prefer to use the vline function instead of vline!, you can achieve the same result by creating a plot object and adding the lines using the vline function.
Here is an example:
using Plots
x = 1:10
y = rand(10)
plot(x, y)
vlines!([5, 8], line=:dash, color=:red)
This code will create the same plot as in option 1, with vertical dashed red lines at x-coordinates 5 and 8.
Option 3: Using plot! and vline! functions
If you want to add vertical lines to an existing plot, you can use the plot! function to create the initial plot and then add the lines using the vline! function.
Here is an example:
using Plots
x = 1:10
y = rand(10)
plot(x, y)
plot!([5, 8], [0, 1], line=:dash, color=:red)
This code will create the same plot as in option 1 and 2, with vertical dashed red lines at x-coordinates 5 and 8.
Among the three options, the best choice depends on your specific use case. If you are creating a new plot from scratch, option 1 or 2 would be more straightforward. If you already have an existing plot and want to add vertical lines, option 3 would be more suitable. Ultimately, it comes down to personal preference and the requirements of your project.
