SimEvents randomising generator block seed in an model executable
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From: Zlatko on 25 Jul 2010 22:01 Hi, I have a SimEvents model which is to be compiled to .exe, using the Real-Time Workshop (RTW) tool, that is to be used for Monte-Carlo simulations. I cannot work out how to make the seeds of the Event-Based Random Number Generators change at each execution of the compiled model. What I did is to set the seeds to mod(ceil(cputime*99999),2^32), but the expression is evaluated on model compilation and the result is inserted as a constant seed. The same thing happens on using rsimgetrtp() when extracting the model tunable parameters structure and as a result the checksums of the compiled model and the parameter structure don't match and the model throws and error on attempt to be executed. I tried to set the seeds as tunable parameters but they are not reflected in the tunable parameters structure obtained by rsimgetrtp(). One other thing I could not work out how to do for the compiled model is how to change the simulation stop time. Any ideas? Thanks in advance. Zlatko.
From: Amanda Galtman on 26 Jul 2010 08:31 "Zlatko " <zdz(a)it-innovation.soton.ac.uk> wrote in message news:i2iq92$8dp$1(a)fred.mathworks.com... > Hi, > I have a SimEvents model which is to be compiled to .exe, using the Real-Time > Workshop (RTW) tool, that is to be used for Monte-Carlo simulations. I cannot > work out how to make the seeds of the Event-Based Random Number Generators > change at each execution of the compiled model. > What I did is to set the seeds to mod(ceil(cputime*99999),2^32), but the > expression is evaluated on model compilation and the result is inserted as a > constant seed. The same thing happens on using rsimgetrtp() when extracting > the model tunable parameters structure and as a result the checksums of the > compiled model and the parameter structure don't match and the model throws > and error on attempt to be executed. > I tried to set the seeds as tunable parameters but they are not reflected in > the tunable parameters structure obtained by rsimgetrtp(). > > One other thing I could not work out how to do for the compiled model is how > to change the simulation stop time. > > Any ideas? > Thanks in advance. > > > Zlatko. Hi Zlatko, Check out the following example in the SimEvents documentation: Example: Computing an Ensemble Average Using Rapid Simulation http://www.mathworks.com/access/helpdesk/help/toolbox/simevents/ug/br7v3l1-1.html In step 2, the example sets the seed parameters in the Event-Based Random Number block dialog boxes to the names of variables in the MATLAB workspace. Then in step 3, the example defines a set of seed values and uses them when calling rsimsetrtpparam. As for changing the simulation stop time, see this topic in the Real-Time Workshop documentation: Overriding a Model Simulation Stop Time http://www.mathworks.com/access/helpdesk/help/toolbox/rtw/ug/f14007.html#f6726 Hope this helps, Amanda
From: Amanda Galtman on 26 Jul 2010 08:32
"Amanda Galtman" <agaltman(a)mathworks.com> wrote in message news:i2jv6g$hji$1(a)fred.mathworks.com... > > "Zlatko " <zdz(a)it-innovation.soton.ac.uk> wrote in message > news:i2iq92$8dp$1(a)fred.mathworks.com... >> Hi, >> I have a SimEvents model which is to be compiled to .exe, using the Real-Time >> Workshop (RTW) tool, that is to be used for Monte-Carlo simulations. I cannot >> work out how to make the seeds of the Event-Based Random Number Generators >> change at each execution of the compiled model. >> What I did is to set the seeds to mod(ceil(cputime*99999),2^32), but the >> expression is evaluated on model compilation and the result is inserted as a >> constant seed. The same thing happens on using rsimgetrtp() when extracting >> the model tunable parameters structure and as a result the checksums of the >> compiled model and the parameter structure don't match and the model throws >> and error on attempt to be executed. >> I tried to set the seeds as tunable parameters but they are not reflected in >> the tunable parameters structure obtained by rsimgetrtp(). >> >> One other thing I could not work out how to do for the compiled model is how >> to change the simulation stop time. >> >> Any ideas? >> Thanks in advance. >> >> >> Zlatko. > > Hi Zlatko, > > Check out the following example in the SimEvents documentation: > > Example: Computing an Ensemble Average Using Rapid Simulation > http://www.mathworks.com/access/helpdesk/help/toolbox/simevents/ug/br7v3l1-1.html > > In step 2, the example sets the seed parameters in the Event-Based Random > Number block dialog boxes to the names of variables in the MATLAB workspace. > Then in step 3, the example defines a set of seed values and uses them when > calling rsimsetrtpparam. > > > As for changing the simulation stop time, see this topic in the Real-Time > Workshop documentation: > > Overriding a Model Simulation Stop Time > http://www.mathworks.com/access/helpdesk/help/toolbox/rtw/ug/f14007.html#f6726 > > > Hope this helps, > Amanda > > Oops, I said step 3 above when I should have said step 4. |