Simple function give complex number

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.

Answer 1

[Star Strider]

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

[boureghda mohammed]

thank you Star Strider.

[Star Strider]

My pleasure.