about accessing the time inside embedded

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Hati
Hati on 30 Jul 2012
I am using clock block to access the current simulation time. This block is connected to matlab embedded function inside the Simulink. This time is available inside embedded function for use. I am giving first 15 samples.
0 1.17773E-09 7.06641E-09 3.65098E-08 1.83727E-07 9.1981E-07 4.60023E-06 2.30023E-05 0.000115013 0.000575065 0.002875328 0.014376639 0.034210553 0.060090116 0.091367769
But my problem is I want use "index" of the simulation time also. How can I do so ? Waiting for your reply...Thank you

Accepted Answer

Sumit Tandon
Sumit Tandon on 30 Jul 2012
Edited: Sumit Tandon on 30 Jul 2012
What do you mean by the "index" - the step count? In that case you could have a counter running inside the MATLAB Function block. Define the counter as a PERSISTENT variable so that it holds its value from previous step.
For example something like this:
function val = myFunction(x)
persistent counter
if isempty(counter)
counter = 0;
else
counter = counter + 1;
end
val = counter*x;

More Answers (1)

Shashank
Shashank on 30 Jul 2012
This can be done by the use of persistent variables in the MATLAB Function. Essentially, Simulink 'remembers' the value of the variable, and hence, by incrementing this variable every time the function is entered, the simulation time index can be obtained.
Care must be taken to initialize the persistent variable the first time the MATLAB Function is entered, however.
More information about persistent variables is available at the following link: http://www.mathworks.com/help/toolbox/eml/ug/bq8nvgq.html

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