Simulink: Why can I load data from workspace containing NaNs and not when I load data from a MAT-file?

Hello,

I am curious to know why it is impossible to load data containing NaNs in Simulink from a MAT-file while it is possible to do so when using the data from the workspace. Any insights would be appreciated.

Thanks

Answer 1

[Cam Salzberger]

Hello Christian-Nils,

I believe that, at least in R2015a, you cannot import data in matrix format that contains NaN or Inf with either a "From Workspace" or "From File" block. Because Simulink is so time-dependent, it is my understanding that this restriction is to prevent the possibility of NaN or Inf time values.

However, if you construct a Simulink Timeseries object and either have it in the workspace or saved to a file, you can include NaN or Inf data values. Here's a quick example:

A = Simulink.Timeseries;
set(A,'Time',(0:3).');
set(A,'Data' , [1 1 NaN 1].');

You can also check out this MATLAB Answers post, which contains data with NaNs and a model that can read it.

I hope this explanation helps!

-Cam

[Christian-Nils Boda]

Hello Cam,

Thank you for your answer and the explanation. I am using R2014b and it seems that "From Workspace" block allows me to import data with NaNs. But I guess I better update my code accordingly to your example (or the other MATLAB Answers post).

Thank you again,

/CN