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我正在嘗試使用一個涉及ode45的代碼,在將要解決的方程式中,我必須從矢量中引入一個單值,這個值將根據解決方程式的時間而改變,我的意思是如果x = x(0),則u1(1)和u2(t),當x = x(1)時,則u1(2),u2(2)...這是我的代碼:MATLAB - 如何從矢量讀取單個值? (ode45參與)
function [sal] = scobe1
clear
clc
global a;
a=1;
assignin('base','a',a)
tspan = [0; 180];
x0 = [80; 0];
[t,x] = ode45(@f,tspan,x0);
sal=[t,x]
figure
subplot(2,1,1)
plot(t,x(:,1),'k-');
subplot(2,1,2)
plot(t,x(:,2),'b-');
function dxdt = f(t,x)
global a s1 u1 u2 newData;
newData=importdata('datosnoembarazo.mat');
assignin('base','newData',newData);
u1=getfield(newData,'glucosa4dias');
assignin('base','u1',u1);
u2=getfield(newData,'insulina4dias');
assignin('base','u2',u2);
u1=getfield(newData,'glucosa4dias');
assignin('base','u1',u1);
u2=getfield(newData,'insulina4dias');
assignin('base','u2',u2);
if (a<=s1)
dxdt = [
(-4.9e-2-x(2))*x(1) + (4.42 + u1(a)) %(1) IN HERE u1 IS THE VECTOR'S NAME
-9.1e-2*x(2) + u2(a) %(2) IN HERE u2 IS THE VECTOR'S NAME
];
a=a+1
assignin('base','a',a);
else return
end
問題是,它給我發出了這個錯誤:我不知道代碼出了什麼問題,或者我還能做些什麼才能讀取它,你能幫我嗎?由於
Error in scobe1>f (line 36)
global a s1 s2 u1 u2 newData;
Error using feval
Output argument "dxdt" (and maybe others) not assigned during call to
"C:\Users\AnnieA\Dropbox\Tesis (A. Olay)\GUI Examples\Resumen de Modelos\scobe1.m>f".
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 scobe1 (line 25)
[t,x] = ode45(@f,tspan,x0);
謝謝,我試了一下,它的工作(: –
在這種情況下,你應該upvote和選擇我的答案,很高興它有幫助 –
你知道什麼是這樣的錯誤:http://stackoverflow.com/問題/ 33987704 /如何插入一個矢量和工作與變量 - ode45?noredirect = 1#comment55733662_33987704?謝謝 –