Error: Index exceeds the number of array elements (0) on the linspace function

I have a following part of a long code that plots two data, Variables (time, value) and frequency ( the same start and end of time of the variables but different values).

The code already does what I want, it plots so many figures until it stops with the following error at the fourth line of the code:

Index exceeds the number of array elements (0).

Error in duration/parenReference (line 17)

that.millis = this.millis(rowIndices);

Error in Erstellungderfrequenzinputbox (line 99)

ftime3=linspace(Uhrzeit(1),Uhrzeit(end),height(freqbereich3));

            freq3 = freqbereich3.fb3;
            freq3 = double(split(string(freq3(2:end-1)) , ","));
            freq3 = freq3(:,1);
            ftime3=linspace(Uhrzeit(1),Uhrzeit(end),height(freqbereich3));
            freqbereich3.ftime3=ftime3';
            nexttile
            plot(ftime3(2:end-1),freq3);
            hold on
            plot(Uhrzeit,Wert)

Uhrzeit is the time and freqbereich3 are both all long tables with values that should have the same length or the same number of values that's why I used the linspace. Any solution or help?

Answer 1

[Walter Roberson]

            ftime3=linspace(Uhrzeit(1),Uhrzeit(end),height(freqbereich3));

If Uhrzeit is empty then Uhrzeit(1) would be out of range.

[Ramo Rafsel]

I just saw that Uhrzeit was empty. And because of the loop it changes its value everytime for each of the Variables that are written in the "Us" variable.

I guess one of the variables has an empty Uhrzeit or no time at all, is there a way how to prevent the error to continue to plot?

Thank you for pointing out the mistake :)

%For-Schleife zum Plotten von den Variablen
for k = 1:numel(U)
    T= [Table1;Table2]; %Aufsummieren der beiden Tabellen in einer.
    Us = ["Variable1";"Variable2";"Variable3";"Variable4";"Variable5";..;"Variable40"];%Eingabe der Variablen;
    U = categorical(Us); %Umwandling des Datentyps von Zelle zum Categorical.
    Var = Variableunits.Variable;
    Num = size(Var,1);
    X = T.Variable==U(k);
    Uhrzeit = round(seconds(T.Time(X)/1000)); %Umwandlung der Uhrzeit zum Format HH:MM:SS
    Uhrzeit.Format='hh:mm:ss';
    Uhrzeit = sort( Uhrzeit,'ascend');
    Wert = T.Value(X);
    if (answer == "ja") % Wenn ein Zeitstempel vorhanden ist
        ind = find(Uhrzeit >= st & Uhrzeit <= et);%Die Uhrzeit zwischen Anfangsuhrzeit und Endzeit einschränken
        Uhrzeit = Uhrzeit(ind);
        Wert = Wert(ind);
    end
    switch answer
        case 'Frequenzbereich 1'
            freq1=freqbereich1.fb1; % Werte des ersten Frequenzbereichs
            freq1 = double(split(string(freq1(1:end-1)) , "."));
            freq1 = freq1(:,1);
            ftime1=linspace(Uhrzeit(1),Uhrzeit(end),height(freqbereich1));
            freqbereich1.ftime1=ftime1';
            nexttile
            yyaxis left
            plot(ftime1(1:end-1),freq1);
            hold on
            yyaxis right
            plot(Uhrzeit,Wert)
            for i = 1:Num
                if Var(i) == U(k)
                    thisunit = Variableunits.Unit(i);
                    if ismissing(thisunit)
                        thisunitname = '';
                    else
                        thisunitname = string(thisunit);
                    end
                    legend('Frequenzbereich1','Messvariable');
                    title(string(Var(i)) + " " + thisunitname + " 10^" + string(Variableunits.NKS(i)), 'Interpreter', 'none');
                end
            end
            hold off
    end  
end

[Walter Roberson]

    T= [Table1;Table2]; %Aufsummieren der beiden Tabellen in einer.

You do not assign to Table1 or Table2 within the loop, so that assignment is going to do the same thing on every loop iteration. I think you need to insert code that modifies Table1 or Table2