Subsystem with similar functionality as of "Unit Delay"

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Anubhav Routray 2023-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/1927365-subsystem-with-similar-functionality-as-of-unit-delay

评论： Paul 2023-3-13

I want to replace all the 'UnitDelay ' blocks in a model with a subsystem which would have the functionality of 'UnitDelay' block.

I want such a subsystem because the initial condition to the 'Unit Delay' block should be passed from a custom block(for example a constant block or From workspace block) as the initial conditions are changed frequently. I have the initial conditions stored in an array. Any help is appreciated. I am using MATLAB 2020a.

(Also I can not use the old Unit Delay with IC block because of my requirement limitations)

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Paul 2023-3-12

"I change the value of IC from 5 to 6 and observe some change."

Are you changing the value of the IC from 5 to 6 while the simulation is running, or after the simulation with IC=5 is complete and you want to use IC = 6 for the next simulation?

Anubhav Routray 2023-3-12

I want to use the IC =6 for the next simulation

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回答（1 个）

Paul 2023-3-12

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Does the Delay block meet the need? It can accept an IC from an external source and is externally resettable.

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Anubhav Routray 2023-3-13

编辑：Anubhav Routray 2023-3-13

I completely agree with your solution. However the scenario that I explained was an example. I have around 500 UDs in the complete model and it is not a feasible way to change the field of every block. I have already created a script where the value of the new IC is ready to be fed automatically. I need a subsytem to replace the all the UDs in the model with a means to feed the new ICs (which I am thinking to be from a "From Workspace" block, but I am open to any other suggestion).

Paul 2023-3-13

I still don't understand why the Delay block (doc page link in he original Answer) doesn't fit the need. It can support a delay of 1, i.e., a unit delay and also supports an externally supplied initial condition.

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