Error with solve function
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
I'm trying to solve these equations and find I1,I2,I3 but when I run it it gives me an error
syms I1 I2 I3
eqn1 = I1*(R_s + X_s) + I3*X_m == V1;
eqn2 = (I2*(X_r + R_r + Z1))/(I3*X_m) == 0;
eqn3 = I1 + I3 - I2 == 0;
S = solve([eqn1,eqn2,eqn3],[I2,I2,I3]);
I1sol = S.I1;
I2sol = S.I2;
I3sol = S.I3;
1 Kommentar
VBBV
am 18 Jun. 2023
Verschoben: VBBV
am 20 Jun. 2023
@Maria Sarcos, It seems you are using the same variable I2 twice to solve the equations. See @Ameer Hamza answer where he used all three variables
syms I1 I2 I3 R_s X_s X_m V1 X_r R_r Z1
eqn1 = I1.*(R_s + X_s) + I3.*X_m == V1;
eqn2 = (I2.*(X_r + R_r + Z1))./(I3*X_m) == 0;
eqn3 = I1 + I3 - I2 == 0;
% ------------------------->> use I1 in place of I2
S = solve([eqn1,eqn2,eqn3],[I1,I2,I3]);
I1sol = S.I1
I2sol = S.I2
I3sol = S.I3
Antworten (1)
Ameer Hamza
am 23 Okt. 2020
You also need to define other variables as symbolic
syms I1 I2 I3 R_s X_s X_m V1 X_r R_r Z1
eqn1 = I1*(R_s + X_s) + I3*X_m == V1;
eqn2 = (I2*(X_r + R_r + Z1))/(I3*X_m) == 0;
eqn3 = I1 + I3 - I2 == 0;
S = solve([eqn1,eqn2,eqn3],[I1,I2,I3]);
I1sol = S.I1;
I2sol = S.I2;
I3sol = S.I3;
3 Kommentare
Siehe auch
Kategorien
Mehr zu Assumptions finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!