Help indexing symbolic ODE in for loop
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
Terry Poole
il 31 Mar 2021
Commentato: Terry Poole
il 31 Mar 2021
Ok so my code works,
P = [0; 22.25; 44.5];
syms w(x) v(x)
Dw = diff(w);
Dv = diff(v);
for i = 1:3
% Deflection in y direction
ode_v = diff(v,x,2) == -Izz/(E*den)*(P(i)*(L-x));
cond1_v = v(0) == 0;
cond2_v = Dv(0) == 0;
conds_v = [cond1_v cond2_v];
vSol(x) = dsolve(ode_v,conds_v);
vSol = vpa(simplify(vSol),3)
% Deflection in Z direction
ode_w = diff(w,x,2) == Iyz/(E*den)*(P(i)*(L-x));
cond1_w = w(0) == 0;
cond2_w = Dw(0) == 0;
conds_w = [cond1_w cond2_w];
wSol(x) = dsolve(ode_w,conds_w);
wSol = vpa(simplify(wSol),3)
end
And my output is:
vSol(x) =
0.0
wSol(x) =
0.0
vSol(x) =
1.41e+13*x^2*(x - 3.0)
wSol(x) =
3.14e+13*x^2*(x - 3.0)
vSol(x) =
2.82e+13*x^2*(x - 3.0)
wSol(x) =
6.29e+13*x^2*(x - 3.0)
>>
Which is correct for all 3 load cases,
My issue is, I'm not sure how to call each case, I can't say vSol(1), because it'll assume x=1 and solve the differential equation. So how would I "index" for lack of a better word each case to generate a plot of (v,w) vs. P? I assume since its a syms function that it's not storing these values as an array, honestly it doesn't seem like it's storing them at all.
Any help on how to call vSol(x)(1), vSol(x)(2) and so on would be greatly appreciated.
0 Commenti
Risposta accettata
Più risposte (0)
Vedere anche
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!