From the series: Solving ODEs in MATLAB ODE45 is usually the function of choice among the ODE solvers. It compares methods of orders four and five to estimate error and determine step size. ODE45 is so accurate
As you are a beginner in MATLAB, use MATLAB Onramp to learn the basics of the new language: https://matlabacademy.mathworks.com/details/matlab-onramp/gettingstarted Concerning your question, it will help to study the "ballode" example here: https://uk.mathworks.com/help/matlab/math/ode-...
Error in FUNC (line 3) dy(1)=y(1); Error in MAIN (line 4) [t,y]=ode45(FUNC,tspan,y0); 嘿嘿,大 现在看出来没?我反正没看出来。但至少根据报错信息知道了问题出在哪一行。现在我在 FUNC.m 的第三行设置一个断点。 我焯我直接被搞懵了,y 变量怎么都读取不到啊,t 也不在工作区,这肯定得...
y(x_n+1)=y(x_n)+hy'(x_n)+(h^2/2!)y''(\zeta_n), \zeta_n\in(x_n,x_n+1) \tag{6} 其中h为步长, h=x_{n+1}-x_n 。当h充分小的时候,略去误差项 T_n=(h^2/2!)y''(\zeta_n)\tag{7} 得微分方程(4)解的近似关系式 \begin{cases} y(x_{n+1})\approx y(x_n)...
因此,我试图建模的系统,如下图所示。我以前用Matlab在ODE45中建模过,但出于某种原因,我一直用下面的代码得到一个奇怪的输出。我不确定这是否是因为我加入了条件if( (Vin )/Ll >= 0),这有助于防止任何电流流向错误方向的二极管,当它是反向偏置。我试着附上这张照片,但
[t,y,te,ye,ie] = ode45(odefun,tspan,y0,options)additionally finds where functions of(t,y), called event functions, are zero. In the output,teis the time of the event,yeis the solution at the time of the event, andieis the index of the triggered event. ...
同时可以引申出分岔图、李雅普诺夫指数谱、相图、庞加莱截面等，本文探讨通过matlab常见的微分求解函数和...
When I run it Matlab gives me this error. Error in ode45 (line 114) [neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ... Error in jipo (line 18) [t,y] = ode45(@jipo1,[0,t_final],X_0); ...
在MATLAB中,ode45是一个常用的常微分方程求解函数,它采用变步长策略来适应不同的求解精度和计算效率。本文将深入解读ode45的变步长策略,并通过代码分析帮助读者理解其工作原理和实现细节。首先,我们需要了解ode45的基本原理。ode45采用四阶龙格-库塔方法(Runge-Kutta method)进行数值积分,该方法是一种常用的常微分方程数值...
function dx=myfun(t,x)dx(1)=20/7*x(1)-x(2)*x(3);dx(2)=-10*x(2)+x(1)*x(3);dx(3)=-4*x(3)+x(1)*x(2);dx=dx(:);这部分保存为m函数文件 命令行运行 >> x0=[3,-4,2];t0=0.001:0.001:20;[t,x]=ode45('myfun',[0.001,20],x0); %ode45会自动...