Simple function give complex number

2016 12 24
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更新时间：2016 12 24
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Hi,
I have theses two function:
f1=-(x5 - x7^(1/a))/(T + T0)^2;
f2=(x8*(T*x5 + T0*x7^(1/a)))/(T0*x7*(T + T0)^2) - (x5*x8)/(T0*x7*(T + T0));
x5,x7,x8 are variables and a,T0,T are parameters.
When I run the code for a range of real values of variables and parameters, I always get a complex number for both functions, I do not know why this is happening.

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Star Strider
Star Strider 2016-12-24

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I suspect ‘x7’ is negative. If ‘a’ is not equal to 1, this will result in a complex result.
Example:
test = (-2)^(1/3)
test =
629.9605e-003 + 1.0911e+000i

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