U128: Division by zero. Ajith Tom George on 2 Oct 2017. I am using a simple model in Simulink in which I use a division on two input values using a 'Divide' block. This method, while adding no overheads to the simulation, would require the reformulation of some equations to be adequately implemented. 0 / NULLIF(column_that_may_be_zero, 0). One of the more common, but thankfully simple to address, error messages is that of a divide by zero error. How can I avoid these problems? There are some simple ways to avoid this condition. The second workaround is demonstrated in the attached model 'example_no_divide_by_zeroFcn'. 599 views (last 30 days). When simulation speed is of paramount importance, reformulating the offending equation to multiply rather than divide might be the most suitable, as no extra calculations are undertaken. Shivaprasad G V on 6 Mar 2019. this would be helpful to avoid the 0/0 or n/0 situation. The 'switch' must only be activated when the signal 'u' is zero. As the name implies, this is where Dymola tries to divide one quantity by another; if the denominator is zero, the result is infinite (and thus undefined).
If you are lucky enough to have a denominator which operates entirely in the positive or negative domains, utilizing the min / max operators will be a fast and robust solution. This often causes a warning, an error message, or erroneous results. Upsides of this method are that it is trivial to implement and will have negligible effect on simulation time. Example Postgres Log Output: ERROR: division by zero STATEMENT: SELECT 1/0. In almost all cases, the best approach is to change the model never feed zero to a division block.
Installing a zero detection clause is robust and relatively easy to implement, but risks either increasing simulation time or potentially introducing a small error to the results. Nate Horn – Vice President. NULLIF like this: SELECT 1. Various methods can be deployed to achieve this, the simplest of which is to write an if statement, where detection of a zero value triggers the use of a non-zero denominator. Arguably the cleanest (mathematically) method to avoid divide by zero errors is to multiply quantities, rather than dividing one by the other. However that may often prove difficult, especially when the source data is user controlled. Or, if the signal 'u' is real: u + eps*(0^u).
The best option very much is up to the user; and varies depending on the application! Similarly, one can use the min operator if the expression in the denominator only operates in the negative space. While this isn't a particularly robust approach, it can often be effective. Instead of using a Matlab function block, the "Fcn" block, which is also available in the list of User-defined functions, would be better. There is also the remote chance that the solver will land on the small value and still result in a simulation termination due to a denominator of zero. Here, I provide 4 possible fixes which can be deployed to get your simulations back up and running. Adding the Modelica small constant is useful when the user wants to work solely in Dymola's graphical interface. Nevertheless, it does introduce a (very) small error to the results. Note that this applies to both integer divisions by zero (. Utilization of the max / min operators within Dymola will not trigger events. This can be added to any denominator variable which tends to zero; as it is so precise, the likelihood of the variable equaling the value of the small constant is much less than that of zero. Use a 'MATLAB Function' block to implement a zero-avoiding condition, such as: How can I avoid errors due to division by zero in Simulink?
Two possible workarounds are as follows. This will return the result of the division in cases where the column is not zero, and return NULL in the cases where it is zero, instead of erroring out. Inside it implement the same logic: u(1)+(u(1)==0)*eps. Recommended Action: In simple cases, the problematic expression can simply be removed. If deployed without using noEvent, the simulation may still fail as the solver may attempt to calculate both of the branches of the statement simultaneously at the event instant, and thus still throw a divide by zero error. Refactor the problem. One final method, is to write code to detect a denominator quantity becoming zero and change the denominator to a non-zero value. Each method presented above has their uses depending upon the application. For clarity purposes, let us call the original signal in the denominator as 'u'. Floating point divisions by zero (. One such is the value, a constant of 1e^-60 (Note that the actual value may vary across tools / platforms).
Hope this will be helpful. Within the Modelica Standard Library, there are various useful constants. This below block prevents the formation of indeterminent form. Dymola simulations can terminate before the simulation end time for a variety of reasons. Start a conversation with us →. Use max / min to avoid zero.
Often this occurs due to a value thats returned from a table, so it may be unclear at first where the problematic zero is coming from. Using Fcn block is better because it works without any additional compiler requirement. Detect zero quantities. Learn More: Couldn't find what you were looking for or want to talk about something specific? You can submit your questions / topics via: Tech Blog Questions / Topic Suggestion.
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