Scattergram

New to Julia
1

I am making a simple scatterplot:

using Plots
        tk = [1,2,3,5,8]
	y = [1. for i in 1:length(tk)]
	pl = scatter(tk, y, title="Poisson train tk")
	display(pl)

This works. However, I feel that there has to be a more Julian way of accomplishing this task. The comprehension list seems like an unnecessary expense, especially if tk if very large. Thanks.

2

FWIW, constructing that list will always take negligible time compared to running the plotting.

2 Likes
3

The comprehension list… it is not quite clear to me why you would make y be equal to 1. for all values of tk, but if that is what you want, here are some other ways:

tk = [1,2,3,5,8]
#y = [1. for i in 1:length(tk)]
#y = ones(length(tk))
function f(t)
    return 1.
end
#pl = scatter(tk, y, title="Poisson train tk")
pl = scatter(tk,f,title="Poisson train tk")
4

Good point. I could use a lambda function (anonymous function). The following works:

pl = scatter(tk, x->1, title="Poisson train tk")

What I really wanted is a set of points along a horizontal axis at a fixed value of y to clearly see the sequence tk.

If you have another good way of displaying this, I am interested to know what it is. Thanks for the answer!

Gordon