Write points at x axis Ploteditor

Hello everyone,

does someone know how to write the value of the points in the x-axis? in my case, I got different periods and I want to write them in the X-axis,

the first one 0.5pi, second 1 pi, ..., the last one 8pi.

I'm thankful for every idea!

Answer 1

[Scott MacKenzie]

If you want text labels with greek symbols, set the x ticks and x tick labels for the axis. Here's the general idea:

x = 0:0.5*pi:2*pi;
y = sin(x);

plot(x,y)
labels = {'0' '{\pi}/2' '{\pi}' '3{\pi}/2' '2{\pi}' };
set(gca,'xtick', x, 'xticklabels', labels);

[Bruce Rogers]

Hello Scott,

this is exactly how I want the plot to look like, but it doesn't work on mine. Here's a part of the code:

p = zeros(1,5);

for i = 1:length(p)
p(1,i) = 0.25*2*pi;
p(2,i) = 0.5*2*pi;
p(3,i) = 1.0*2*pi;
p(4,i) = 2.0*2*pi;
p(5,i) = 4.0*2*pi;
end

figure(6)
plot(p,delta_s,'-o')
title('Grün: 0.2, Lila: 0.1, Gelb: 0.05, Rot: 0.025, Blau: 0.01')
labels = {'0' '{\pi}/2' '{\pi}' '3{\pi}/2' '2{\pi}' '5{\pi}/2' '3{\pi}' '7{\pi}/2' '4{\pi}' '9{\pi}/2' '5{\pi}' '11{\pi}/2' '6{\pi}' '13{\pi}/2' '7{\pi}' '15{\pi}/2' '8{\pi}'};
set(gca,'xtick', p, 'xticklabels', labels);
xlabel('Periodendauer')
ylabel('Differenz der Periodenmaxima')
legend('Blau: 100Hz','Rot: 40Hz','Gelb: 20Hz','Lila: 10Hz','Grün: 5Hz')

And that's the error message:

Error using matlab.graphics.axis.Axes/set

Value must be a numeric vector whose values increase.

Error in Einfluss_Abtastrate (line 622)

set(gca,'xtick', p, 'xticklabels', labels);

[Scott MacKenzie]

Some minor tweaks...

n = 5;
p = zeros(1,n);

for i = 1:length(p)
p(1,i) = 0.25*2*pi;
p(2,i) = 0.5*2*pi;
p(3,i) = 1.0*2*pi;
p(4,i) = 2.0*2*pi;
p(5,i) = 4.0*2*pi;
end

delta_s = rand(1,5); % data added to avoid crash (change, as necessary)

figure(6)
plot(p,delta_s,'-o')
title('Grün: 0.2, Lila: 0.1, Gelb: 0.05, Rot: 0.025, Blau: 0.01')
labels = {'0' '{\pi}/2' '{\pi}' '3{\pi}/2' '2{\pi}' '5{\pi}/2' '3{\pi}' '7{\pi}/2' '4{\pi}' '9{\pi}/2' '5{\pi}' '11{\pi}/2' '6{\pi}' '13{\pi}/2' '7{\pi}' '15{\pi}/2' '8{\pi}'};
set(gca,'xtick', p(:,1), 'xticklabels', labels);
xlabel('Periodendauer');
ylabel('Differenz der Periodenmaxima');
legend('Blau: 100Hz','Rot: 40Hz','Gelb: 20Hz','Lila: 10Hz','Grün: 5Hz', ...
    'location', 'southeast');

[Bruce Rogers]

Thanks for your help, thats perfect! :)