Output of Simulink Discrete time derivative at the start of simulation

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Mohammad Ashraful Islam
回答： Harikrishnan Balachandran Nair 2021-9-23
Output of the discrete time derivative at the start of simulation (t=0) is very high as it seems to only divide the current input with sample time.
If it's not a bug, is there a way to use the intial input as "Initial condition" and hence outputting zero as derivative at time step t=0?

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回答（1 个）

Harikrishnan Balachandran Nair
Hi,
I understand that you are trying to output an initial condition value at the simulation start time, different from the actual output from the block.
You can use the 'IC' block from the simulink library to set the initial condition of the signal at its input port.The 'IC' block outputs the specified initial condition when you start the simulation, regardless of the actual value of the input signal. Thereafter, the block outputs the actual value of the input signal.

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