CODEWITHSUNDEEP
matlabmathsymbolic-math
salam
salam

Reputation: 229

Finding the points where a complex function is real-valued

I have defined the following complex system:

syms x 
sys(x) = ((10+1.*i.*x))/(20+(5.*i.*x)+((10.*i.*x).^2))+((1.*i.*x).^3); 
ImaginaryPart = imag(sys)

MATLAB returned the following results:

ImaginaryPart(x) =

- real(x^3) + imag((10 + x*1i)/(- 100*x^2 + x*5i + 20))


RealPart(x) =

- real(x^3) + imag((10 + x*1i)/(- 100*x^2 + x*5i + 20))

Now for which value of x will ImaginaryPart(x) be 0? (i.e. ImaginaryPart(x)= 0)?

Upvotes: 3

Views: 39

Answers (1)

Adriaan
Adriaan

Reputation: 18177

As @AndrasDeak commented, solve will do the trick for you:

S = solve(ImaginaryPart(x)== 0,x);

Upvotes: 4

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