An error occurred while running the simulation and the simulation was terminated Caused by: Domain error. To compute complex results from real x, use 'sqrt(complex(x))'.

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chuyen hoangcao 2020-12-30

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https://ww2.mathworks.cn/matlabcentral/answers/705588-an-error-occurred-while-running-the-simulation-and-the-simulation-was-terminated-caused-by-domain-e

评论： chuyen hoangcao 2020-12-31

sedung.slx

I dont know why my model has this error because in my code,i have never ust SQRT function.Hope all you help me,especially Sebastian.

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Answer 1

Walter Roberson 2020-12-30

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https://ww2.mathworks.cn/matlabcentral/answers/705588-an-error-occurred-while-running-the-simulation-and-the-simulation-was-terminated-caused-by-domain-e#answer_587708

在 MATLAB Online 中打开

o =0.5;
R = anpha*sige1+beta*sige2*t;%2x1
s = dq +R;%2x1
s1 = s(1,1);
s2 = s(2,1);
sigs1 = [(s1^o)*sign(s1);(s2^o)*sign(s2)];

s1^0.5 is sqrt(s1), but your s1 or s2 are negative.

Your code already expects that they might be negative: otherwise it would not have the multiplication by sign() as it would have assumed that the sign is constant.

sigs1 = [(abs(s1)^o)*sign(s1);(abs(s2)^o)*sign(s2)];

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chuyen hoangcao 2020-12-31

Thank you so much for helping me.I add abs for all power expression includeing s,e.After that,it also appears another error about derivative 1 is not finite...It took me a little time to change into fixed-step,and it worked.

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