Why is my variable not staying updated in Simulink
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Hello,
I am using Simulink and have a variable set to zero in an enabled subsystem. I send the signal out of the subsystem and am trying to update it as x = x + 1 where x is the signal. After simulink goes through all the blocks once and gets back to where x = x + 1 the x is reset to 0. I have a breakpoint in the enabled subsystem where I initialized it and it never goes back there. Any ideas would be appreciated. Thank you!
2 Commenti
Kaustubha Govind
il 18 Giu 2013
Could you please explain what block(s) you use to implement the x=x+1 part?
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Erwin Torreao Dassen
il 18 Giu 2013
Modificato: Erwin Torreao Dassen
il 18 Giu 2013
Is this a custom matlab function block? In that case try declaring the variable persistent. (UPDATED)
3 Commenti
Erwin Torreao Dassen
il 19 Giu 2013
I'm not sure I understand what you trying to achieve. My guess of what is happening is that your matlab-function block that defines x = 0 is being used as input outside the subsystem. If that is the case the first block outside this subsytem will always receive 0 as input signal and it will never output more than 1... In fact, your matlab-function block is just a "constant" block.
What is the behavior you want to obtain?
Regards, Erwin
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