How to set axis as -pi to pi ?

Hi. I have attached my program for the radiation pattern of the horn antenna. I want to have a graph which should have axis from -pi to pi. but I cant do it. When I use set(gca,'XTick',-pi:pi/2:pi) set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'}) command, the figure appears to be some what like I have attached. Please help.

Answer 1

[Mischa Kim]

Leena, in the code you are converting the angels (x-axis) from rad to deg. Also it seems like the angular range is between 0 and 360 deg. Therefore,

• remove the conversion factor, e.g., e = theta, or simply use theta for plotting,
• and set

 set(gca,'XTick',0:pi/2:2*pi) 
 set(gca,'XTickLabel',{'0','pi/2','pi','3*pi/2','2*pi'})

[Leena]

It worked. Thank u so much :)

Answer 2

[Chris J]

or better still use \pi to generate nice pi characters, for example:

set(gca,'XTick',-2*pi:pi:2*pi)
ax.XTickLabel = {'-2\pi','-\pi','0','\pi','2\pi'};

Answer 3

[Ítalo Pedrosa]

I had the same problem. Reading the comments, I did:

function plot_radian(X, int, Y)

axisX = X(1):int:X(end);

plot(X, Y)
set(gca,'XTick',axisX)
set(gca,'XTickLabel', string(sym(axisX)))
grid on

Solved my problem for any situations. But you need the syms

[ibrahim guler]

If you have so many points to plot it would crash your program. Therefore, you should add some restriction in the begining of the function I think.