How to display a plot going to infinity?

I am meant to plot the Dirac Delta function:

my attempt:

x = -30:1:30;
y = zeros(1,numel(x)); %sets all values initially to zero
y(x==0)= inf; % the point corresponding to x=0 is set to inf
plot(x,y,'d')
axis([-40 40 0 inf])

How can I get it to visually show it going up to infinity?

[Muhammad]

Use the tick property in Matlab plot as described below

[Zeynab Mousavikhamene]

Did you find any answer to your question?

Answer 1

[KSSV]

    x = -30:1:30;
    y = zeros(1,numel(x)); %sets all values initially to zero
    y(x==0)= inf; % the point corresponding to x=0 is set to inf
    plot(x,y,'d')

text(-41.,0.65,'~','Fontsize',20)
text(-41.,0.67,'~','Fontsize',20)

text(39,0.65,'~','Fontsize',20)
text(39,0.67,'~','Fontsize',20)

axis([-40 40 0 inf])

Adjust the text positions.....

[Natasha Simone]

Sorry I wasn't clear, I am looking to visually display the value of x=0 going to infinity like in this figure:

[Walter Roberson]

There are a couple of File Exchange contributions for creating plots with broken axes.