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

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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!
  2 Comments
Walter Roberson
Walter Roberson on 12 Jul 2019
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.
David K. on 12 Jul 2019
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.

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Answers (2)

Samatha Aleti
Samatha Aleti on 17 Jul 2019
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];

Nikita khapate
Nikita khapate on 4 Oct 2020
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

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