"Runtime Error: Call to MATLAB function aborted: Domain error. To compute complex results, make at least one input complex, e.g. 'power(complex(a),b)'."

Elizabeth asked: 2020-07-10 simulink, matlab

Fix Runtime Error: Call to MATLAB function aborted; domain error with complex numbers! Learn how to use power and handle complex results in MATLAB. Get solu

Expert Answer

Prashant Kumar answered . 2025-07-17 14:01:38

When there is a expression that might produce a complex result, the input signals for the calculation must be changed to Complex, or you must use complex() on the real signals that might produce a complex result. For example if you have sqrt() then if the input might go negative then you need to complex() the input before taking the sqrt.

I gather the error shows up at the time the need for a complex result is detected, so if you are not expecting the calculation to produce a complex result you may need to add debugging to see why it does produce such a result.

MATLAB silently transforms values to complex at need, but Simulink does not.

When you have a loop, Simulink has to solve the loop to establish the initial conditions for self-consistency because everything in one step has to be true simultaneously (if that is not needed for you then send your signal through a time delay so the rest of the calculation can be performed in the next step) . The result can include values outside the range you expect.

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