[英]Not enough input arguments in function Matlab
我在開發GUI來解決微分方程時遇到問題,但找不到錯誤。
我要求解的方程式定義為:
T*x'+x = kSigma*heaviside(t-t0) + kSin*sin(Omega*t+alpha*pi/180).
我嘗試過的方法是:
function lsg = DGLvar(t,T,Omega)
x = 1;
kSin = 1;
kSigma = 5;
t0 = 0;
alpha = 0;
lsg = 1/T * (-x + kSigma*heaviside(t-t0) + kSin*sin(Omega*t+alpha*pi/180) );
在GUI中,代碼如下所示:
function pushbutton1_Callback(hObject, ~, handles)
t=[0 100];
periode=get(handles.sliderT,'value');
Omega=get(handles.slideromega,'value');
[x,t]=ode45(@DGLvar,t,periode,Omega);
plot(handles.axes2,x,t,'g')
我收到以下錯誤:
Error using DGLvar (line 8)
Not enough input arguments.
Error in odearguments (line 87)
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
Error in ode45 (line 113)
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...
Error in PT1>pushbutton1_Callback (line 218)
[x,t]=ode45(@DGLvar,t,periode,Omega);
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in PT1 (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)PT1('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
如何解決此錯誤?
求解器ode45
期望輸入f(t,x)
作為函數f(t,x)
並使用它來求解方程x'=f(t,x)
。
您需要將x
用作函數DGLvar
的參數。 我還建議將其重命名為xprime
,因為這更具描述性。
function xp = xprime(t,x,T,Omega)
kSin = 1;
kSigma = 5;
t0 = 0;
alpha = 0;
xp = 1/T * (-x + kSigma*heaviside(t-t0) + kSin*sin(Omega*t+alpha*pi/180) );
GUI代碼如下所示:
%% Get the GUI values:
tspan = [0 100];
x0 = 0;
T = get(handles.sliderT, 'value');
Omega = get(handles.slideromega, 'value');
%% Define a function with two parameters @(t,x) for ode45.
xprimefixedTandOmega = @(t,x) xprime(t, x, T, Omega);
%% Solve the equation: x' = xprimefixedTandOmega(t,x), x(0)=0 for t=0...100.
[t,x] = ode45(xprimefixedTandOmega, tspan, x0);
%% Plot the result of solver
plot(handles.axes2, t, x, 'g');
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