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

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Alfried
Alfried 2014-1-6
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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Alfried
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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Alfried
Alfried 2014-1-9
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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Vincent Nicolazzo
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

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