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我们试图用matlab的ode23求解器对DC/DC降压转换器建模。当我们试图运行我们的代码下面的错误上来:matlab ode23求解器错误未知
??? Error using ==> odearguments at 91
The last entry in tspan must be different
from the first entry.
Error in ==> ode23 at 171
[neq, tspan, ntspan, next, t0, tfinal,
tdir, y0, f0, odeArgs, odeFcn, ...
Error in ==> buck2 at 13
[t,x] = ode23(@event1,[t0 tf],x0);
当我们采取的是修改了初始条件数组的代码运行没有错误,但不会产生预期的结果的代码。
这是我们的代码:
function buck2
close all
clear all
clc
t0 = 0;
tf = 1;
x0 = [0 0]; % Initial conditions
for i = 1:10
if (1 <= i <= 4),
[t,x] = ode23(@event1,[t0 tf],x0);
nt = length(t);
else
[t,x] = ode23(@event2,[t0 tf],x0);
nt = length(t);
end
t0 = t(nt);
x0 = x(nt);
end
plot(t,x)
function xdot = event1(t,x)
L = (12.12e-6);
C = (19.5e-6);
RC = (2.5*19.5e-6);
xdot = [(24/L) - (x(2)/L); (x(1)/C) - (x(2)/RC)];
function xdot = event2(t,x)
L = (12.12e-6);
C = (19.5e-6);
RC = (2.5*19.5e-6);
xdot = [-(x(2)/L); (x(1)/C) - (x(2)/RC)];