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matlab 'Index exceeds array boundaries'

3 次查看（过去 30 天）
alsgud qor
alsgud qor 2020-4-19
关闭： MATLAB Answer Bot 2021-8-20
by this code, that error happens...and i dunno why...
function H12 =H1(t,X)
m=10;
c=1000;
k=100000;
e=0.001;
w=100;
R=0.5;
X=R*cos(w*t);
Y=R*sin(w*t);
F1=m*e*w^2*cos(w*t);
F2=m*e*w^2*sin(w*t);
H12=[X(2); -c/m*X(2)-k/m*X(1)+F1/m];
end
--------------------------------------------------------
t=0:0.1:20;
X0=[0,0];
>>
[t,X]=ode45(@H1,t,X0);
  2 个评论
madhan ravi
madhan ravi 2020-4-19
编辑：madhan ravi 2020-4-19
What’s X(2) ? Will you post the latex form of the equation?
alsgud qor
alsgud qor 2020-4-19
编辑：alsgud qor 2020-4-19
It s a second derivate form...um..I think I misunderstood that matlab automatically understood that thing...also X(1) is equal to X's first derivate..I put
X(1)=diff(X);
X(2)=diff(X(1));
in that function and it s still ain't working...

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回答（1 个）

Devineni Aslesha
Devineni Aslesha 2020-4-21
编辑：Devineni Aslesha 2020-4-21
In the given code, the initial conditions are passed to 'ode45' from the variable 'X0' which is a vector. The 'X0' values are taken by the variable 'X' to obtain the ode solver output. However, in the code, the variable 'X' is modified in such a way that it becomes a scalar value due to which the error occurs. The error can be resolved by not modifying the variable 'X' in the function definition.
I would like to know why the variable 'X' has to be modified in the function definition.

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