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How can I avoid errors due to division by zero in Simulink?

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I am using a simple model in Simulink in which I use a division on two input values using a 'Divide' block.
During my simulation, there might be a zero value fed to the denominator of the 'Divide' block. This often causes a warning, an error message, or erroneous results.
How can I avoid these problems?

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 13 Feb 2023
Edited: MathWorks Support Team on 13 Feb 2023
This answer was flagged by Will
Numerical division by zero is a common issue in programming, and its exact solution often depends on the particular application. In almost all cases, the best approach is to change the model never feed zero to a division block.
Two possible workarounds are as follows. For clarity purposes, let us call the original signal in the denominator as 'u'.
  1. Use a 'switch' block to pass 'eps' instead of 'u' to the 'divide' denominator. The 'switch' must only be activated when the signal 'u' is zero.
  2. Use a 'MATLAB Function' block to implement a zero-avoiding condition, such as:
u + (u==0)*eps
or, if the signal 'u' is real:
u + eps*(0^u)
The second workaround is demonstrated in the attached model 'example_no_divide_by_zeroFcn'.

More Answers (1)

madhan ravi
madhan ravi on 10 Jan 2024
Or making the result to be zero when the divisor is zero using a Switch block

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