Error when using "Retain State"

User: "Tom_abc"
Tom_abc
Altair Community Member
Updated by Tom_abc

When I run it ('Error_Retain_State.vsm') only once or using 'Auto Restart', it can run successfully. However, if I further choose the 'Retain State', the model will produce an error called 'CVode-- Trouble interpolating at...'.

Can someone tell me why this error occurs? It seems a very simple example (only a variable and an integratrator) yet the error still occurs. Please see attached Vissim file.

 

<?xml version="1.0" encoding="UTF-8"?>Model1.png

<?xml version="1.0" encoding="UTF-8"?>Error1.png

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    User: "Ric_22025"
    Ric_22025
    Altair Employee
    Updated by Ric_22025

    Hi Tom_abc

     

    Did you purposely set the integration type to BDF?  the error you are seeing is related to the settings you've chosen for BDF.  Try running your model with RK2 or RK4 and you should see the correct behavior with retain state.  

     

    Ric

    User: "Tom_abc"
    Tom_abc
    Altair Community Member
    OP
    Updated by Tom_abc

    Yes I purposely chose the BDF method for the model. Thank you Ric, it now have no error message if we chose other methods. So does it means that we cannot 'retain state' if we use BDF method?

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