How do I make the x-axis go to infinity so my graph can repeat?

Hey guys! So i am trying to graph this formula:

y=cos(2*pi*z*n/d)

The graph is supposed to be repetitive so I was wondering if there was anyway I could make the x-axis (Z) go to infinity both ways. Right now, I only know how to graph by setting limits on the x-axis when coding. Here's what it currently looks like:

I tried inf , but that did not work. Also, n and d are constants. Thanks in advance!

[Walter Roberson]

Oddly it is permitted to use xlim with inf as the upper limit. The effect is similar to setting xlimmode to auto: it determines the limit according to the data plotted.

[David K.]

I'm not entirely certain what it is you want. If you want the plot to show the repetetive nature you may want to increase the bounds of your z variable. If you just want the x-axis to indicate that the plot continues to infinity, you could try manually setting the x-axis with xticklabels:

xticklabels({'-\infty','-20','-10','0','10','20','\infty'})

Not sure what it is you exactly want though.

Answer 1

[Samatha Aleti]

Hi,

Specifying “XLim” property as "“Inf” has similar effect as auto mode. However, you can view the plot for large range values (fixed- values) of X-Axis by specifying large finite values. Here is an example :

% Get handle to current axes 
ax = gca; 
% Specify XLim 
ax.XLim = [-10^5  10^5]; 

Answer 2

[Nikita khapate]

x = -inf: 0.1 : 2;
y = 2*(x.^2) + 3*(x) + 4;
plot(x,y)

hold on 
x = 2 :0.1:2;
y = 0;
plot(x,y)
hold on 
x = 2.1 : 0.1 : inf;
y = -2*(x.^2) + 3*(x) -4;
plot(x,y)
hold off

[Walter Roberson]

>> x = -inf: 0.1 : 2;
Requested array exceeds the maximum possible variable size.