Getting shifted frequency curves instead of normal ones

Why do I get somehow displaced curves ( see first picture) that should normally be an unshifted curve?(see the second picture)

The frequency is calculated through given frequency values and a time column

The code looks like the following

    nexttile
    Fd1 = double(split(string(fdim1(1:end-1)) , ","));
    Fd1 = Fd1(:,1);
    plot(timefdim1(1:end-1),Fd1);
    xticks([timefdim1(1) timefdim1(end-1)]);
    yticks([Fd1(1) Fd1(end-1)]);
    title('dimfrequency 1')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 150kHz - 80 MHz')
    
    nexttile
    Fd2 = double(split(string(fdim2(2:end-1)) , ","));
    Fd2 = Fd2(:,1);
    plot(timefdim2(2:end-1),Fd2);
    xticks([timefdim2(2) timefdim2(end-1)]);
    yticks([Fd2(2) Fd2(end-1)]);
    title('dimfrequency 2')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 80 MHz - 1 GHz')
    
    nexttile
    Fd3 = double(split(string(fdim3(3:end-1)) , ","));
    Fd3 = Fd3(:,1);
    plot(timefdim3(3:end-1),Fd3);
    xticks([timefdim3(1) timefdim3(end-1)]);
    yticks([Fd3(1) Fd3(end-1)])
    title('dimfrequency 3')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 1 GHz - 2,7 GHz')

    nexttile
    F1 = double(split(string(fbll1(1:end-1)) , ","));
    F1 = F1(:,1);
    plot(timefbll1(1:end-1),F1);
    xticks([timefbll1(1) timefbll1(end-1)]);
    yticks([F1(1) F1(end-1)]);
    title('bllfrequency 1')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 150kHz - 80 MHz')
    
    nexttile
    F2 = double(split(string(fbll2(2:end-1)) , ","));
    F2 = F2(:,1);
    plot(timefbll2(2:end-1),F2);
    xticks([timefbll2(2) timefbll2(end-1)]);
    yticks([F2(2) F2(end-1)]);
    title('bllfrequency 2')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 80 MHz - 1 GHz')
    
    nexttile
    F3 = double(split(string(fbll3(3:end-1)) , ","));
    F3 = F3(:,1);
    plot(timefbll3(3:end-1),F3);
    xticks([timefbll3(1) timefbll3(end-1)]);
    yticks([F3(1) F3(end-1)]) 
    title('bllfrequency 3')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 1 GHz - 2,7 GHz')

Thanks a lot in advance for the help.

[Ameer Hamza]

The only reason this could happen is that the vectors timefdim2 and timefdim3, does not have time values in increasing order. Check these two vectors to see why time is randomly changing.

[Ramo Rafsel]

I just checked them and all the 6 time vectors are in increasing order and also the frequency values. Does that have something to do with the categorical type maybe? I ve been trying to solve it since over a month now but still do not know why are the curves shifted...

Thanks a lot for the help :)

[Ameer Hamza]

Can you share the code you are using to create the plots?

[Ramo Rafsel]

This is the written code for the plotting:

      nexttile
    Fd1 = double(split(string(fdim1(1:end-1)) , ","));
    Fd1 = Fd1(:,1);
    plot(timefdim1(1:end-1),Fd1);
    xticks([timefdim1(1) timefdim1(end-1)]);
    yticks([Fd1(1) Fd1(end-1)]);
    title('dimfrequency 1')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 150kHz - 80 MHz')

    nexttile
    Fd2 = double(split(string(fdim2(2:end-1)) , ","));
    Fd2 = Fd2(:,1);
    plot(timefdim2(2:end-1),Fd2);
    xticks([timefdim2(2) timefdim2(end-1)]);
    yticks([Fd2(2) Fd2(end-1)]);
    title('dimfrequency 2')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 80 MHz - 1 GHz')

    nexttile
    Fd3 = double(split(string(fdim3(3:end-1)) , ","));
    Fd3 = Fd3(:,1);
    plot(timefdim3(3:end-1),Fd3);
    xticks([timefdim3(1) timefdim3(end-1)]);
    yticks([Fd3(1) Fd3(end-1)])
    title('dimfrequency 3')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 1 GHz - 2,7 GHz')

    nexttile
    F1 = double(split(string(fbll1(1:end-1)) , ","));
    F1 = F1(:,1);
    plot(timefbll1(1:end-1),F1);
    xticks([timefbll1(1) timefbll1(end-1)]);
    yticks([F1(1) F1(end-1)]);
    title('bllfrequency 1')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 150kHz - 80 MHz')

    nexttile
    F2 = double(split(string(fbll2(2:end-1)) , ","));
    F2 = F2(:,1);
    plot(timefbll2(2:end-1),F2);
    xticks([timefbll2(2) timefbll2(end-1)]);
    yticks([F2(2) F2(end-1)]);
    title('bllfrequency 2')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 80 MHz - 1 GHz')

    nexttile
    F3 = double(split(string(fbll3(3:end-1)) , ","));
    F3 = F3(:,1);
    plot(timefbll3(3:end-1),F3);
    xticks([timefbll3(1) timefbll3(end-1)]);
    yticks([F3(1) F3(end-1)]) 
    title('bllfrequency 3')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 1 GHz - 2,7 GHz')

Answer 1

[Ameer Hamza]

The time vectors were stored in categorical datatype (bad choice). Therefore, you were getting that unexpected plots. Try the following code. I have only added lines before the plot() statement.

nexttile
Fd1 = double(split(string(fdim1(1:end-1)) , ","));
Fd1 = Fd1(:,1);
timefdim1 = duration(string(timefdim1));
plot(timefdim1(1:end-1),Fd1);
xticks([timefdim1(1) timefdim1(end-1)]);
yticks([Fd1(1) Fd1(end-1)]);
title('dimfrequency 1')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 150kHz - 80 MHz')

nexttile
Fd2 = double(split(string(fdim2(2:end-1)) , ","));
Fd2 = Fd2(:,1);
timefdim2 = duration(string(timefdim2));
plot(timefdim2(2:end-1),Fd2);
xticks([timefdim2(2) timefdim2(end-1)]);
yticks([Fd2(2) Fd2(end-1)]);
title('dimfrequency 2')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 80 MHz - 1 GHz')

nexttile
Fd3 = double(split(string(fdim3(3:end-1)) , ","));
Fd3 = Fd3(:,1);
timefdim3 = duration(string(timefdim3));
plot(timefdim3(3:end-1),Fd3);
xticks([timefdim3(1) timefdim3(end-1)]);
yticks([Fd3(1) Fd3(end-1)])
title('dimfrequency 3')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 1 GHz - 2,7 GHz')

nexttile
F1 = double(split(string(fbll1(1:end-1)) , ","));
F1 = F1(:,1);
timefbll1 = duration(string(timefbll1));
plot(timefbll1(1:end-1),F1);
xticks([timefbll1(1) timefbll1(end-1)]);
yticks([F1(1) F1(end-1)]);
title('bllfrequency 1')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 150kHz - 80 MHz')

nexttile
F2 = double(split(string(fbll2(2:end-1)) , ","));
F2 = F2(:,1);
timefbll2 = duration(string(timefbll2));
plot(timefbll2(2:end-1),F2);
xticks([timefbll2(2) timefbll2(end-1)]);
yticks([F2(2) F2(end-1)]);
title('bllfrequency 2')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 80 MHz - 1 GHz')

nexttile
F3 = double(split(string(fbll3(3:end-1)) , ","));
F3 = F3(:,1);
timefbll3 = duration(string(timefbll3));
plot(timefbll3(3:end-1),F3);
xticks([timefbll3(1) timefbll3(end-1)]);
yticks([F3(1) F3(end-1)])
title('bllfrequency 3')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 1 GHz - 2,7 GHz')

[Ramo Rafsel]

Thanks a lot Ameer, you solved a problem that I have been dealing with weeks long!

I just thought maybe I can ask this too since it is the next step and I am not sure whether it is even possible or not.

Is it possible to plot both figures in one, even though both vectors (or the time length) of the two figures are not the same? (see the picture)

The first figure contains the blue average line and the frequency, the second figure contains a variable in Volt.

[Ameer Hamza]

Yes, it is possible. You can use hold() command and then call several plot commands. All of them will be drawn on one axes

hold on
plot(...)
plot(...)