Specifying time frames for Simulink simulation, using colon operator, gives invalid data

I am using the below command:

sim(test.settings.model, [time(1) time(end)], [], input_struct);

Where input_struct is defined via:

input_struct.time
  input_struct.signals(j).label
  input_struct.signals(j).dataType
  input_struct.signals(j).dimensions

If the "inports" have interpolation on, then "time" variable does not math with the following format of specified time frames:

 t1 = [0:1/80:11/80]'  % Do not work even though I provide in double format

I am providing 12 frames of time data which must align perfectly with time variable in input_struct, to prevent interpolation.

I can fix the problem by specifying time via:

t2 = 0.0125*[0:11]'

Using format long and taking the difference between these 2 approaches (t1-t2) frame 10 is not close enough to 0.

If the inports have interpolation off and t1 format is used, then Sim is holding last value and thus not using my exact input (I provided in the input_struct signals data).

Bottom line, the first method (t1) of specifying time is not accurate enough. Please expalin behavior?

Answer 1

[MathWorks Support Team]

Please refer to the following documentation page that explains why one format works and the other does not:

https://www.mathworks.com/help/releases/R2020a/simulink/ug/load-data-to-root-level-input-ports-1.html#bsuwoyk