Please tell me how to erase meaningless lines from graphs!

In the graph above, I want to erase the line that crosses pi at -pi, how can I do it?

I wasn't there originally... It's a simple question, but I can't solve it.

plot(data(:,1),data(:,2))

xlim([-pi pi])

xticks(-pi:pi/2:pi)

xticklabels({'-\pi','-\pi/2','0','\pi/2','\pi'})

pbaspect([ 1 1 1])

grid on

xlabel('rad')

ylabel('mm')

Answer 1

[Dyuman Joshi]

There is repetition in your data, 1st and Last row are the same.

%plot upto 2nd last row
plot(data(1:end-1,1),data(1:end-1,2)) 
xlim([-pi pi])
xticks(-pi:pi/2:pi)
xticklabels({'-\pi','-\pi/2','0','\pi/2','\pi'})
pbaspect([ 1 1 1])
grid on
xlabel('rad')
ylabel('mm')

Answer 2

[Star Strider]

There is no need to discard any data. Just use sortrows to sort them —

LD = load(websave('data','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1117765/data.mat'));
data = LD.u;
data = sortrows(data,1);

plot(data(:,1),data(:,2)) 
xlim([-pi pi])
    xticks(-pi:pi/2:pi)
    xticklabels({'-\pi','-\pi/2','0','\pi/2','\pi'})
pbaspect([ 1 1 1])
grid on
    xlabel('rad')
    ylabel('mm')

The ‘wrapped’ lines are almost always solved by sorting.

.