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Problem with cosine function

Problem with cosine function


I am fascinated from the sysdyn tool! Big thanks to it's developers.I am trying to simulate a simple model, spring_mass system, in which cosine function is used, please see attached file. Unfortunately, I got an error message "Simulation failed. No value for xdd". I have a feeling, that the program doesn't understand that the cosine function exist in it's list of functions.

Please help

I didn't find the right solution from the internet.

References: … c.php?t=11
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