How to substitute a variable into a syms function?

Question

Aditya Zade 2024-5-28

评论： Aditya Zade 2024-5-28

I would like to substitute terms "Lp * Cps * ws^2" as "Kp" in the following B0. How could that be done?

syms Vpo Von Dp Dn ws Lp Cps Ll Lm Vsecm Isec_real Isec_imag Isec_abs Thetasec Ix_real Ix_imag Ix_abs Kp Kl Km real

Kp = Lp * Cps * ws^2;

B0 = Cps^2*Ix_abs*Lp^3*ws^9*(- Lm*ws*Isec_abs^2 + Isec_imag*Vsecm*cos(Thetasec) + Isec_real*Vsecm*sin(Thetasec));

Answer 1

Dyuman Joshi 2024-5-28

Define the variable as a symbolic variable and then substitute -

syms Vpo Von Dp Dn ws Lp Cps Ll Lm Vsecm Isec_real Isec_imag Isec_abs Thetasec Ix_real Ix_imag Ix_abs Kp Kl Km real

%Kp = Lp * Cps * ws^2;

B0 = Cps^2*Ix_abs*Lp^3*ws^9*(- Lm*ws*Isec_abs^2 + Isec_imag*Vsecm*cos(Thetasec) + Isec_real*Vsecm*sin(Thetasec))

B0 =

%Definition

syms Kp

%Substition

B0 = subs(B0, Lp * Cps * ws^2, Kp)

B0 =

Aditya Zade 2024-5-28

Thank you.