Controlling output from Simulink

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Tan Edwin 2011-3-8

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Hi all

My simulink is running at a fixed time step of 0.1 and i need my block to produce output at alternate time like 0,0.2,0.4,etc

Can GetTimeOfNextVarHit of lvl 1 S-function block fulfil this requirement?

If not how should i do it?

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Tan Edwin 2011-3-8

just tested GetTimeOfNextVarHit, it seems to only give me a transport delay?

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Answer 1

Kaustubha Govind 2011-3-8

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Why not set the S-function sample time to 2*ssGetFixedStepSize(S) in mdlInitializeSampleTimes? You might also want to protect your code using ssIsVariableStepSolver to ensure that a variable-step solver isn't being used.

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Tan Edwin 2011-3-9

wat is the equivalence of ssGetFixedStepSize in m programming language? cos im not trained in C, C++ programming.

and it is a lvl 2 s-function right?

thanks

Kaustubha Govind 2011-3-11

Try str2num(get_param(bdroot,'FixedStep'))

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Answer 2

Andreas Goser 2011-3-8

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Check out the menu:

Simulation -> Configuration Parameters -> Data Import/Export

In your example, you could just enter a decimation of 2. But you have also other option, see the pull-down "Output options". You can e.g. produce additional output.

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Tan Edwin 2011-3-8

i actually have other blocks in my .mdl that need to run at the fixed time of 0.1 so wouldnt this method affect all the other blocks?

i just need the one block to run at alternate time and the rest at normal time.

Thanks for the suggestion and so sorry that i didn't make myself clear earlier.

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Answer 3

Paulo Silva 2011-3-8

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在 MATLAB Online 中打开

Try with the matlab Fcn block

out=u(1) %or out=u

It will put the value in the block input to the variable out in the matlab workspace, that way you can share data with other models, do the same thing to get data from the workspace

out %the value of out will be the output of the Fcn block

And maybe putting 0.2 on the matlab Fcn sample time will only update or get the out value each 0.2 seconds.