To compute complex results from real x, use 'sqrt(complex(x))

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Prateek Tiwari
Prateek Tiwari 2020-5-29
回答： Sahithi Kanumarlapudi 2020-6-1
A= [exp(sqrt(-w1/w2)*t) , exp(-sqrt(-w1/w2)*t) ]
I have this matrix with w1,w2 as contant and t is the time update every instance in simulink.
When I run the simulink, I am getting the error "Domain error: To compute complex results from real x, use 'sqrt(complex(x))". I tried looking for thr help, did not get the answer correctly. I understand from one of the answers that it is because the range limit is exceeded than expected. However I coulnot find the solution to solve my issue. Can anyone help me in this.

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Sahithi Kanumarlapudi
Hi,
Passing a negative value to the 'sqrt' function might be the reason for this error.
Refer to the last paragraph of the answer posted at the following link.
https://www.mathworks.com/matlabcentral/answers/103508-why-do-i-get-a-domain-error-regarding-complex-numbers-when-running-mex-functions-created-by-matlab-c
Your issue is not related to Matlab coder, But the reason might be the same.

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