Initial state vector "X0" must be a real vector of length 103.

Hello All,

I am modifying a system built in SIMULINK. The old one works. I just changed three blocks: Discrete Filter, Variable Fractional Delay and constant. I run the .m code file and always get the error message "Initial state vector "X0" must be a real vector of length 103.". I don't know how to fix it. Any help and suggestions are appreciated.

Thanks, Yihong

Answer 1

[Guy Rouleau]

You modified a Discrete Filter, this block has states and you very likely changed the number of states. I recommend running the command Simulink.BlockDiagram.getInitialState:

http://www.mathworks.com/help/toolbox/simulink/slref/simulink.blockdiagram.getinitialstate.html

This will give you the number of states in your model.

You seem to run your model using the SIM command, look at the doc for this command to learn how to pass an appropriate set of initial states:

http://www.mathworks.com/help/toolbox/simulink/slref/sim.html

Once you understand that, this link should be useful:

http://www.mathworks.com/help/toolbox/simulink/gui/bq7cpr_.html#bq8qrtx-1

Answer 2

[Paulo Silva]

My suggestion is for you to provide more details and/or that .m code you talk about