How can I change an initial/constant value in a simulink model

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Alfried 2014-1-6

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编辑： Vincent Nicolazzo 2019-3-6

Hey together,

I am receiving two signal from an external source into simulink. depending on the value of each signal I need to change some constant variable in my model, but I dont know how to do it.

Another thing is, that I have to rewrite a constant variable in a user defined matlab-function, but I dont know how to do it as well.

I hope, you can help me out.

greetings

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Azzi Abdelmalek 2014-1-6

Can you provide more details?

Alfried 2014-1-7

thanks for your answer. here's a picture of my current model:

i know that the input is missing but thats not the point here. i think i solved one of my problems already.

so my other problem still is, that the variable firstRun is initialized to 1, then an image is stored in the variable origImg. but i dont know how to change the variable firstRun to the value 0 after this is done, so that in the next simulationstep the else-case will do its job.

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Answer 1

Alfried 2014-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/111586-how-can-i-change-an-initial-constant-value-in-a-simulink-model#answer_120438

ok I'm updating my question, because it's still current. Heres is my current simulink model:

my problems are still the same. so I'm going to explain again, what I want to do actually. The variable initRun is initialized to 1. so the else-case will be activated and an 176x177 image is stored to the data origImg.

And here is my first Problem: after an image is stored to origImg the variable initRun shall be set to the value 0, so that in the next simulation step the if-case will be activated.

My second problem: the variable origImg must be initialized correctly. But I dont find a way to initialize a 176x144 matrix in the block "Data Store Memory" (see picture):

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Answer 2

Vincent Nicolazzo 2019-3-6

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编辑：Vincent Nicolazzo 2019-3-6

Check out this link. It's not the best method but it worked for me. I would run my simullation and change the value of the constant in the command window.

https://www.mathworks.com/help/simulink/ug/parameter-values-and-specification-methods.html

Be sure to change the constant's sample time to anything but inf