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How do I access and plot thetadot vs. time from function I have created?

조회 수: 1 (최근 30일)
function thetadot= oscltr(t,theta)
A= [0 0 0.5 0 0 0; 0.5 0 0 0 0 0.5; 0.5 0.5 0 0 0 0; 0 0.5 0 0 0 0; 0 0 0.5 0 0 0; 0 0 0 0.5 0.5 0]; % edge weight matrix
D= [0.5 0 0 0 0 0; 0 1 0 0 0 0; 0 0 1 0 0 0; 0 0 0 0.5 0 0; 0 0 0 0 0.5 0; 0 0 0 0 0 1]; %Diagonal in-degree matrix
L= D-A; %Laplacian matrix
N=6;
K=50;
wi=[1; 1.1 ;0.9; 0.85; 2; 2.1];
thetadot=wi-(K/N)*L*theta;
end

채택된 답변

Walter Roberson
Walter Roberson 2022년 10월 8일
Please see my response at https://www.mathworks.com/matlabcentral/answers/1818985-how-to-work-variables-outside-function#answer_1068360 discussing why it is unlikely that you want to access the internal variables computed by an ode function: such a record would have far too many entries and would also not have entries for most of the time steps.

추가 답변 (1개)

Ghazwan
Ghazwan 2022년 10월 8일
편집: Walter Roberson 2022년 10월 8일
There are several ways, one of whith would be
Dtheta=diff(theta) %theta = values
Dtime=diff(time) %time = time values.
ThetaDot = Dtheta./Dtime.
plot(Dtheta,time) % you have to be careful in case there is 0/0 somewhere.
  댓글 수: 2
Walter Roberson
Walter Roberson 2022년 10월 8일
I recommend using gradient() instead. The timestep for ode45 is typically irregular.
Torsten
Torsten 2022년 10월 8일
Just call the function with the values for theta of your choice.

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