How to save the initial value of a variable ? (Simulink)

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CamG52 2018-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/409812-how-to-save-the-initial-value-of-a-variable-simulink

评论： CamG52 2018-7-11

Hello everyone,

I have two position variables x and y that change everytime my vehicle moves. What I would like is to save the initial value of x and y in order to use it in a function using Simulink. However, I can't use the block 'save to workspace' because you have access to the variables at the end of the simulation and I need them during the simulation.

I tried with 'Tapped delay' too but the value of the variables change.

Thank you very much for you help and have a nice day !

Camille

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Answer 1

goerk 2018-7-11

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You can just 'Sample And Hold' the signal at the first tick.

A 'Sample and Hold' is basically only a triggered subsystem where the output is connected to the input.

You can also use a switch and a unit delay to implement the same functionality. (Switching signal is true only for the first tick, switch inputs is the signal and the delayed output)