Understanding Symbolic Math in MATLAB: Real and Imaginary Parts

[zhaniko93]

I have such MATLAB problem: I create variables R1 RF R2 and w so:

syms RF R1 R2 w

then I write expression:

3*R1*w*(RF + 200)/((R2*w*29*i + 3)*(3*R1*w - 2*i))

which gives:

(3*R1*w*(RF + 200))/((3*R1*w - 2*sqrt(-1))*(R2*w*29*sqrt(-1) + 3))

why sqrt(-1) and not i? furthermore? if I want real part of the expression and write:

real(ans)

it gives:

3*real((R1*w*(RF + 200))/((3*R1*w - 2*sqrt(-1))*(R2*w*29*sqrt(-1) + 3)))

can anyone please help me??

 

[zhaniko93]

anybody please