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Initial zero value of every variable in Simulink

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I have created a cosimulation control system for ADAMS/Car in Simulink, solving with a discrete solver. I have some blocks that make divisions and the problem is that when the simulation starts, every variable begins with a value of zero even it is a constant (I have checked with the debugger). For this reason, I have error and the simulation does not run.
What can I do to avoid this zero-initialization of the variables?
Thank you in advance.

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Sebastian il 25 Mar 2011
You might use Initial Condition (IC) blocks from the Signal Attributes sublibrary in Simulink. Those blocks allow you to specify an initial value for a signal. Also, some blocks have an option to specify initial values for States and others you might replace by blocks that have this option.

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