How to append time series?

Hi all,

I need to append several timeseries object but I am obtain the following error:

Error using timeseries/append>localConcat (line 57)
The time vectors of the specified time series must be consecutive.

I do not understand what is wrong with the code reported below since the time vector is consecutive and there are no repetitive time. Can you help me?

PrescriptionMap(:,1)=[0 10 30 60 65 85 100];
PrescriptionMap(:,2)=randi([5 40],1,length(PrescriptionMap(:,1)));
PrescriptionMap(:,3)=PrescriptionMap(:,1)/Speed;

for i=1:length(PrescriptionMap(:,1))-1    
    InputStair(i)=frest.createStep('StepTime',PrescriptionMap(i,1)/Speed,'StepSize',PrescriptionMap(i,1),'FinalTime',PrescriptionMap(i+1)-1)/Speed);
end

InputStairSum=append(InputStair(1),InputStair(2));

Morever, can I transform the data into a double array?

Thank you so much.

Best regards,

Michele

[Image Analyst]

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You didn't give the whole error message, namely the line of code that threw the error (line 57). I have no idea which of the lines in that extracted snippet is line 57.

Also, what is frest.createStep?

And the help says append() concatenates strings, not time series variables.